webhooks/github: Add support for pull request ready for review.

GitHub supports opening a draft/WIP pull request and then marking it
as ready for review later on. This PR supports the ready_for_review
action for pull_request events.

Signed-off-by: Hemanth V. Alluri <hdrive1999@gmail.com>

zerver/webhooks/github/fixtures/pull_request__ready_for_review.json

@@ -0,0 +1,486 @@
+{
+  "action": "ready_for_review",
+  "number": 2,
+  "pull_request": {
+    "url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/pulls/2",
+    "id": 416695222,
+    "node_id": "MDExOlB1bGxSZXF1ZXN0NDE2Njk1MjIy",
+    "html_url": "https://github.com/Hypro999/temp-test-github-webhook/pull/2",
+    "diff_url": "https://github.com/Hypro999/temp-test-github-webhook/pull/2.diff",
+    "patch_url": "https://github.com/Hypro999/temp-test-github-webhook/pull/2.patch",
+    "issue_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/issues/2",
+    "number": 2,
+    "state": "open",
+    "locked": false,
+    "title": "Test",
+    "user": {
+      "login": "Hypro999",
+      "id": 29123352,
+      "node_id": "MDQ6VXNlcjI5MTIzMzUy",
+      "avatar_url": "https://avatars3.githubusercontent.com/u/29123352?v=4",
+      "gravatar_id": "",
+      "url": "https://api.github.com/users/Hypro999",
+      "html_url": "https://github.com/Hypro999",
+      "followers_url": "https://api.github.com/users/Hypro999/followers",
+      "following_url": "https://api.github.com/users/Hypro999/following{/other_user}",
+      "gists_url": "https://api.github.com/users/Hypro999/gists{/gist_id}",
+      "starred_url": "https://api.github.com/users/Hypro999/starred{/owner}{/repo}",
+      "subscriptions_url": "https://api.github.com/users/Hypro999/subscriptions",
+      "organizations_url": "https://api.github.com/users/Hypro999/orgs",
+      "repos_url": "https://api.github.com/users/Hypro999/repos",
+      "events_url": "https://api.github.com/users/Hypro999/events{/privacy}",
+      "received_events_url": "https://api.github.com/users/Hypro999/received_events",
+      "type": "User",
+      "site_admin": false
+    },
+    "body": "WIP -> Ready for review test.",
+    "created_at": "2020-05-12T12:33:03Z",
+    "updated_at": "2020-05-12T12:34:03Z",
+    "closed_at": null,
+    "merged_at": null,
+    "merge_commit_sha": null,
+    "assignee": {
+      "login": "Hypro999",
+      "id": 29123352,
+      "node_id": "MDQ6VXNlcjI5MTIzMzUy",
+      "avatar_url": "https://avatars3.githubusercontent.com/u/29123352?v=4",
+      "gravatar_id": "",
+      "url": "https://api.github.com/users/Hypro999",
+      "html_url": "https://github.com/Hypro999",
+      "followers_url": "https://api.github.com/users/Hypro999/followers",
+      "following_url": "https://api.github.com/users/Hypro999/following{/other_user}",
+      "gists_url": "https://api.github.com/users/Hypro999/gists{/gist_id}",
+      "starred_url": "https://api.github.com/users/Hypro999/starred{/owner}{/repo}",
+      "subscriptions_url": "https://api.github.com/users/Hypro999/subscriptions",
+      "organizations_url": "https://api.github.com/users/Hypro999/orgs",
+      "repos_url": "https://api.github.com/users/Hypro999/repos",
+      "events_url": "https://api.github.com/users/Hypro999/events{/privacy}",
+      "received_events_url": "https://api.github.com/users/Hypro999/received_events",
+      "type": "User",
+      "site_admin": false
+    },
+    "assignees": [
+      {
+        "login": "Hypro999",
+        "id": 29123352,
+        "node_id": "MDQ6VXNlcjI5MTIzMzUy",
+        "avatar_url": "https://avatars3.githubusercontent.com/u/29123352?v=4",
+        "gravatar_id": "",
+        "url": "https://api.github.com/users/Hypro999",
+        "html_url": "https://github.com/Hypro999",
+        "followers_url": "https://api.github.com/users/Hypro999/followers",
+        "following_url": "https://api.github.com/users/Hypro999/following{/other_user}",
+        "gists_url": "https://api.github.com/users/Hypro999/gists{/gist_id}",
+        "starred_url": "https://api.github.com/users/Hypro999/starred{/owner}{/repo}",
+        "subscriptions_url": "https://api.github.com/users/Hypro999/subscriptions",
+        "organizations_url": "https://api.github.com/users/Hypro999/orgs",
+        "repos_url": "https://api.github.com/users/Hypro999/repos",
+        "events_url": "https://api.github.com/users/Hypro999/events{/privacy}",
+        "received_events_url": "https://api.github.com/users/Hypro999/received_events",
+        "type": "User",
+        "site_admin": false
+      }
+    ],
+    "requested_reviewers": [],
+    "requested_teams": [],
+    "labels": [],
+    "milestone": null,
+    "draft": false,
+    "commits_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/pulls/2/commits",
+    "review_comments_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/pulls/2/comments",
+    "review_comment_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/pulls/comments{/number}",
+    "comments_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/issues/2/comments",
+    "statuses_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/statuses/4e538c4ff2c1e1d4150dd2cf2b1e1b8004aaeadb",
+    "head": {
+      "label": "Hypro999:test",
+      "ref": "test",
+      "sha": "4e538c4ff2c1e1d4150dd2cf2b1e1b8004aaeadb",
+      "user": {
+        "login": "Hypro999",
+        "id": 29123352,
+        "node_id": "MDQ6VXNlcjI5MTIzMzUy",
+        "avatar_url": "https://avatars3.githubusercontent.com/u/29123352?v=4",
+        "gravatar_id": "",
+        "url": "https://api.github.com/users/Hypro999",
+        "html_url": "https://github.com/Hypro999",
+        "followers_url": "https://api.github.com/users/Hypro999/followers",
+        "following_url": "https://api.github.com/users/Hypro999/following{/other_user}",
+        "gists_url": "https://api.github.com/users/Hypro999/gists{/gist_id}",
+        "starred_url": "https://api.github.com/users/Hypro999/starred{/owner}{/repo}",
+        "subscriptions_url": "https://api.github.com/users/Hypro999/subscriptions",
+        "organizations_url": "https://api.github.com/users/Hypro999/orgs",
+        "repos_url": "https://api.github.com/users/Hypro999/repos",
+        "events_url": "https://api.github.com/users/Hypro999/events{/privacy}",
+        "received_events_url": "https://api.github.com/users/Hypro999/received_events",
+        "type": "User",
+        "site_admin": false
+      },
+      "repo": {
+        "id": 263329224,
+        "node_id": "MDEwOlJlcG9zaXRvcnkyNjMzMjkyMjQ=",
+        "name": "temp-test-github-webhook",
+        "full_name": "Hypro999/temp-test-github-webhook",
+        "private": false,
+        "owner": {
+          "login": "Hypro999",
+          "id": 29123352,
+          "node_id": "MDQ6VXNlcjI5MTIzMzUy",
+          "avatar_url": "https://avatars3.githubusercontent.com/u/29123352?v=4",
+          "gravatar_id": "",
+          "url": "https://api.github.com/users/Hypro999",
+          "html_url": "https://github.com/Hypro999",
+          "followers_url": "https://api.github.com/users/Hypro999/followers",
+          "following_url": "https://api.github.com/users/Hypro999/following{/other_user}",
+          "gists_url": "https://api.github.com/users/Hypro999/gists{/gist_id}",
+          "starred_url": "https://api.github.com/users/Hypro999/starred{/owner}{/repo}",
+          "subscriptions_url": "https://api.github.com/users/Hypro999/subscriptions",
+          "organizations_url": "https://api.github.com/users/Hypro999/orgs",
+          "repos_url": "https://api.github.com/users/Hypro999/repos",
+          "events_url": "https://api.github.com/users/Hypro999/events{/privacy}",
+          "received_events_url": "https://api.github.com/users/Hypro999/received_events",
+          "type": "User",
+          "site_admin": false
+        },
+        "html_url": "https://github.com/Hypro999/temp-test-github-webhook",
+        "description": "testing the GitHub webhook",
+        "fork": false,
+        "url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook",
+        "forks_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/forks",
+        "keys_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/keys{/key_id}",
+        "collaborators_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/collaborators{/collaborator}",
+        "teams_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/teams",
+        "hooks_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/hooks",
+        "issue_events_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/issues/events{/number}",
+        "events_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/events",
+        "assignees_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/assignees{/user}",
+        "branches_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/branches{/branch}",
+        "tags_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/tags",
+        "blobs_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/git/blobs{/sha}",
+        "git_tags_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/git/tags{/sha}",
+        "git_refs_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/git/refs{/sha}",
+        "trees_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/git/trees{/sha}",
+        "statuses_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/statuses/{sha}",
+        "languages_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/languages",
+        "stargazers_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/stargazers",
+        "contributors_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/contributors",
+        "subscribers_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/subscribers",
+        "subscription_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/subscription",
+        "commits_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/commits{/sha}",
+        "git_commits_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/git/commits{/sha}",
+        "comments_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/comments{/number}",
+        "issue_comment_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/issues/comments{/number}",
+        "contents_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/contents/{+path}",
+        "compare_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/compare/{base}...{head}",
+        "merges_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/merges",
+        "archive_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/{archive_format}{/ref}",
+        "downloads_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/downloads",
+        "issues_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/issues{/number}",
+        "pulls_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/pulls{/number}",
+        "milestones_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/milestones{/number}",
+        "notifications_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/notifications{?since,all,participating}",
+        "labels_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/labels{/name}",
+        "releases_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/releases{/id}",
+        "deployments_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/deployments",
+        "created_at": "2020-05-12T12:25:21Z",
+        "updated_at": "2020-05-12T12:28:04Z",
+        "pushed_at": "2020-05-12T12:33:04Z",
+        "git_url": "git://github.com/Hypro999/temp-test-github-webhook.git",
+        "ssh_url": "git@github.com:Hypro999/temp-test-github-webhook.git",
+        "clone_url": "https://github.com/Hypro999/temp-test-github-webhook.git",
+        "svn_url": "https://github.com/Hypro999/temp-test-github-webhook",
+        "homepage": null,
+        "size": 0,
+        "stargazers_count": 0,
+        "watchers_count": 0,
+        "language": null,
+        "has_issues": true,
+        "has_projects": true,
+        "has_downloads": true,
+        "has_wiki": true,
+        "has_pages": false,
+        "forks_count": 0,
+        "mirror_url": null,
+        "archived": false,
+        "disabled": false,
+        "open_issues_count": 1,
+        "license": null,
+        "forks": 0,
+        "open_issues": 1,
+        "watchers": 0,
+        "default_branch": "master"
+      }
+    },
+    "base": {
+      "label": "Hypro999:master",
+      "ref": "master",
+      "sha": "070550d4fb89551cb55c1e9bd9f73ed2d8b10ae8",
+      "user": {
+        "login": "Hypro999",
+        "id": 29123352,
+        "node_id": "MDQ6VXNlcjI5MTIzMzUy",
+        "avatar_url": "https://avatars3.githubusercontent.com/u/29123352?v=4",
+        "gravatar_id": "",
+        "url": "https://api.github.com/users/Hypro999",
+        "html_url": "https://github.com/Hypro999",
+        "followers_url": "https://api.github.com/users/Hypro999/followers",
+        "following_url": "https://api.github.com/users/Hypro999/following{/other_user}",
+        "gists_url": "https://api.github.com/users/Hypro999/gists{/gist_id}",
+        "starred_url": "https://api.github.com/users/Hypro999/starred{/owner}{/repo}",
+        "subscriptions_url": "https://api.github.com/users/Hypro999/subscriptions",
+        "organizations_url": "https://api.github.com/users/Hypro999/orgs",
+        "repos_url": "https://api.github.com/users/Hypro999/repos",
+        "events_url": "https://api.github.com/users/Hypro999/events{/privacy}",
+        "received_events_url": "https://api.github.com/users/Hypro999/received_events",
+        "type": "User",
+        "site_admin": false
+      },
+      "repo": {
+        "id": 263329224,
+        "node_id": "MDEwOlJlcG9zaXRvcnkyNjMzMjkyMjQ=",
+        "name": "temp-test-github-webhook",
+        "full_name": "Hypro999/temp-test-github-webhook",
+        "private": false,
+        "owner": {
+          "login": "Hypro999",
+          "id": 29123352,
+          "node_id": "MDQ6VXNlcjI5MTIzMzUy",
+          "avatar_url": "https://avatars3.githubusercontent.com/u/29123352?v=4",
+          "gravatar_id": "",
+          "url": "https://api.github.com/users/Hypro999",
+          "html_url": "https://github.com/Hypro999",
+          "followers_url": "https://api.github.com/users/Hypro999/followers",
+          "following_url": "https://api.github.com/users/Hypro999/following{/other_user}",
+          "gists_url": "https://api.github.com/users/Hypro999/gists{/gist_id}",
+          "starred_url": "https://api.github.com/users/Hypro999/starred{/owner}{/repo}",
+          "subscriptions_url": "https://api.github.com/users/Hypro999/subscriptions",
+          "organizations_url": "https://api.github.com/users/Hypro999/orgs",
+          "repos_url": "https://api.github.com/users/Hypro999/repos",
+          "events_url": "https://api.github.com/users/Hypro999/events{/privacy}",
+          "received_events_url": "https://api.github.com/users/Hypro999/received_events",
+          "type": "User",
+          "site_admin": false
+        },
+        "html_url": "https://github.com/Hypro999/temp-test-github-webhook",
+        "description": "testing the GitHub webhook",
+        "fork": false,
+        "url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook",
+        "forks_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/forks",
+        "keys_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/keys{/key_id}",
+        "collaborators_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/collaborators{/collaborator}",
+        "teams_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/teams",
+        "hooks_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/hooks",
+        "issue_events_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/issues/events{/number}",
+        "events_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/events",
+        "assignees_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/assignees{/user}",
+        "branches_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/branches{/branch}",
+        "tags_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/tags",
+        "blobs_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/git/blobs{/sha}",
+        "git_tags_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/git/tags{/sha}",
+        "git_refs_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/git/refs{/sha}",
+        "trees_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/git/trees{/sha}",
+        "statuses_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/statuses/{sha}",
+        "languages_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/languages",
+        "stargazers_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/stargazers",
+        "contributors_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/contributors",
+        "subscribers_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/subscribers",
+        "subscription_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/subscription",
+        "commits_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/commits{/sha}",
+        "git_commits_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/git/commits{/sha}",
+        "comments_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/comments{/number}",
+        "issue_comment_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/issues/comments{/number}",
+        "contents_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/contents/{+path}",
+        "compare_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/compare/{base}...{head}",
+        "merges_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/merges",
+        "archive_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/{archive_format}{/ref}",
+        "downloads_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/downloads",
+        "issues_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/issues{/number}",
+        "pulls_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/pulls{/number}",
+        "milestones_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/milestones{/number}",
+        "notifications_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/notifications{?since,all,participating}",
+        "labels_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/labels{/name}",
+        "releases_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/releases{/id}",
+        "deployments_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/deployments",
+        "created_at": "2020-05-12T12:25:21Z",
+        "updated_at": "2020-05-12T12:28:04Z",
+        "pushed_at": "2020-05-12T12:33:04Z",
+        "git_url": "git://github.com/Hypro999/temp-test-github-webhook.git",
+        "ssh_url": "git@github.com:Hypro999/temp-test-github-webhook.git",
+        "clone_url": "https://github.com/Hypro999/temp-test-github-webhook.git",
+        "svn_url": "https://github.com/Hypro999/temp-test-github-webhook",
+        "homepage": null,
+        "size": 0,
+        "stargazers_count": 0,
+        "watchers_count": 0,
+        "language": null,
+        "has_issues": true,
+        "has_projects": true,
+        "has_downloads": true,
+        "has_wiki": true,
+        "has_pages": false,
+        "forks_count": 0,
+        "mirror_url": null,
+        "archived": false,
+        "disabled": false,
+        "open_issues_count": 1,
+        "license": null,
+        "forks": 0,
+        "open_issues": 1,
+        "watchers": 0,
+        "default_branch": "master"
+      }
+    },
+    "_links": {
+      "self": {
+        "href": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/pulls/2"
+      },
+      "html": {
+        "href": "https://github.com/Hypro999/temp-test-github-webhook/pull/2"
+      },
+      "issue": {
+        "href": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/issues/2"
+      },
+      "comments": {
+        "href": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/issues/2/comments"
+      },
+      "review_comments": {
+        "href": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/pulls/2/comments"
+      },
+      "review_comment": {
+        "href": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/pulls/comments{/number}"
+      },
+      "commits": {
+        "href": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/pulls/2/commits"
+      },
+      "statuses": {
+        "href": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/statuses/4e538c4ff2c1e1d4150dd2cf2b1e1b8004aaeadb"
+      }
+    },
+    "author_association": "OWNER",
+    "merged": false,
+    "mergeable": null,
+    "rebaseable": null,
+    "mergeable_state": "unknown",
+    "merged_by": null,
+    "comments": 2,
+    "review_comments": 0,
+    "maintainer_can_modify": false,
+    "commits": 2,
+    "additions": 1,
+    "deletions": 0,
+    "changed_files": 1
+  },
+  "repository": {
+    "id": 263329224,
+    "node_id": "MDEwOlJlcG9zaXRvcnkyNjMzMjkyMjQ=",
+    "name": "temp-test-github-webhook",
+    "full_name": "Hypro999/temp-test-github-webhook",
+    "private": false,
+    "owner": {
+      "login": "Hypro999",
+      "id": 29123352,
+      "node_id": "MDQ6VXNlcjI5MTIzMzUy",
+      "avatar_url": "https://avatars3.githubusercontent.com/u/29123352?v=4",
+      "gravatar_id": "",
+      "url": "https://api.github.com/users/Hypro999",
+      "html_url": "https://github.com/Hypro999",
+      "followers_url": "https://api.github.com/users/Hypro999/followers",
+      "following_url": "https://api.github.com/users/Hypro999/following{/other_user}",
+      "gists_url": "https://api.github.com/users/Hypro999/gists{/gist_id}",
+      "starred_url": "https://api.github.com/users/Hypro999/starred{/owner}{/repo}",
+      "subscriptions_url": "https://api.github.com/users/Hypro999/subscriptions",
+      "organizations_url": "https://api.github.com/users/Hypro999/orgs",
+      "repos_url": "https://api.github.com/users/Hypro999/repos",
+      "events_url": "https://api.github.com/users/Hypro999/events{/privacy}",
+      "received_events_url": "https://api.github.com/users/Hypro999/received_events",
+      "type": "User",
+      "site_admin": false
+    },
+    "html_url": "https://github.com/Hypro999/temp-test-github-webhook",
+    "description": "testing the GitHub webhook",
+    "fork": false,
+    "url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook",
+    "forks_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/forks",
+    "keys_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/keys{/key_id}",
+    "collaborators_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/collaborators{/collaborator}",
+    "teams_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/teams",
+    "hooks_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/hooks",
+    "issue_events_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/issues/events{/number}",
+    "events_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/events",
+    "assignees_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/assignees{/user}",
+    "branches_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/branches{/branch}",
+    "tags_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/tags",
+    "blobs_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/git/blobs{/sha}",
+    "git_tags_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/git/tags{/sha}",
+    "git_refs_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/git/refs{/sha}",
+    "trees_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/git/trees{/sha}",
+    "statuses_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/statuses/{sha}",
+    "languages_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/languages",
+    "stargazers_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/stargazers",
+    "contributors_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/contributors",
+    "subscribers_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/subscribers",
+    "subscription_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/subscription",
+    "commits_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/commits{/sha}",
+    "git_commits_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/git/commits{/sha}",
+    "comments_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/comments{/number}",
+    "issue_comment_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/issues/comments{/number}",
+    "contents_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/contents/{+path}",
+    "compare_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/compare/{base}...{head}",
+    "merges_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/merges",
+    "archive_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/{archive_format}{/ref}",
+    "downloads_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/downloads",
+    "issues_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/issues{/number}",
+    "pulls_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/pulls{/number}",
+    "milestones_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/milestones{/number}",
+    "notifications_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/notifications{?since,all,participating}",
+    "labels_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/labels{/name}",
+    "releases_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/releases{/id}",
+    "deployments_url": "https://api.github.com/repos/Hypro999/temp-test-github-webhook/deployments",
+    "created_at": "2020-05-12T12:25:21Z",
+    "updated_at": "2020-05-12T12:28:04Z",
+    "pushed_at": "2020-05-12T12:33:04Z",
+    "git_url": "git://github.com/Hypro999/temp-test-github-webhook.git",
+    "ssh_url": "git@github.com:Hypro999/temp-test-github-webhook.git",
+    "clone_url": "https://github.com/Hypro999/temp-test-github-webhook.git",
+    "svn_url": "https://github.com/Hypro999/temp-test-github-webhook",
+    "homepage": null,
+    "size": 0,
+    "stargazers_count": 0,
+    "watchers_count": 0,
+    "language": null,
+    "has_issues": true,
+    "has_projects": true,
+    "has_downloads": true,
+    "has_wiki": true,
+    "has_pages": false,
+    "forks_count": 0,
+    "mirror_url": null,
+    "archived": false,
+    "disabled": false,
+    "open_issues_count": 1,
+    "license": null,
+    "forks": 0,
+    "open_issues": 1,
+    "watchers": 0,
+    "default_branch": "master"
+  },
+  "sender": {
+    "login": "Hypro999",
+    "id": 29123352,
+    "node_id": "MDQ6VXNlcjI5MTIzMzUy",
+    "avatar_url": "https://avatars3.githubusercontent.com/u/29123352?v=4",
+    "gravatar_id": "",
+    "url": "https://api.github.com/users/Hypro999",
+    "html_url": "https://github.com/Hypro999",
+    "followers_url": "https://api.github.com/users/Hypro999/followers",
+    "following_url": "https://api.github.com/users/Hypro999/following{/other_user}",
+    "gists_url": "https://api.github.com/users/Hypro999/gists{/gist_id}",
+    "starred_url": "https://api.github.com/users/Hypro999/starred{/owner}{/repo}",
+    "subscriptions_url": "https://api.github.com/users/Hypro999/subscriptions",
+    "organizations_url": "https://api.github.com/users/Hypro999/orgs",
+    "repos_url": "https://api.github.com/users/Hypro999/repos",
+    "events_url": "https://api.github.com/users/Hypro999/events{/privacy}",
+    "received_events_url": "https://api.github.com/users/Hypro999/received_events",
+    "type": "User",
+    "site_admin": false
+  }
+}

zerver/webhooks/github/tests.py

@@ -263,6 +263,10 @@ class GithubWebhookTest(WebhookTestCase):
         expected_message = "eeshangarg unassigned [PR #1](https://github.com/zulip-test-org/helloworld/pull/1)."
         self.send_and_test_stream_message('pull_request__unassigned', 'helloworld / PR #1 Mention that Zulip rocks!', expected_message)
 
+    def test_pull_request_ready_for_review_msg(self) -> None:
+        expected_message = "**Hypro999** has marked [PR #2](https://github.com/Hypro999/temp-test-github-webhook/pull/2) as ready for review."
+        self.send_and_test_stream_message('pull_request__ready_for_review', 'temp-test-github-webhook / PR #2 Test', expected_message)
+
     def test_pull_request_review_requested_msg(self) -> None:
         expected_message = "**eeshangarg** requested [showell](https://github.com/showell) for a review on [PR #1](https://github.com/eeshangarg/Scheduler/pull/1)."
         self.send_and_test_stream_message('pull_request__review_requested', 'Scheduler / PR #1 This is just a test commit', expected_message)

zerver/webhooks/github/view.py

@@ -276,6 +276,16 @@ def get_status_body(payload: Dict[str, Any]) -> str:
         status
     )
 
+def get_pull_request_ready_for_review_body(payload: Dict[str, Any],
+                                           include_title: Optional[bool]=False) -> str:
+
+    message = "**{sender}** has marked [PR #{pr_number}]({pr_url}) as ready for review."
+    return message.format(
+        sender = get_sender_name(payload),
+        pr_number = payload['pull_request']['number'],
+        pr_url = payload['pull_request']['html_url']
+    )
+
 def get_pull_request_review_body(payload: Dict[str, Any],
                                  include_title: Optional[bool]=False) -> str:
     title = "for #{} {}".format(
@@ -456,6 +466,7 @@ EVENT_FUNCTION_MAPPER = {
     'page_build': get_page_build_body,
     'ping': get_ping_body,
     'public': get_public_body,
+    'pull_request_ready_for_review': get_pull_request_ready_for_review_body,
     'pull_request_review': get_pull_request_review_body,
     'pull_request_review_comment': get_pull_request_review_comment_body,
     'pull_request_review_requested': get_pull_request_review_requested_body,
@@ -510,6 +521,8 @@ def get_event(request: HttpRequest, payload: Dict[str, Any], branches: Optional[
             return 'closed_pull_request'
         if action == 'review_requested':
             return '{}_{}'.format(event, action)
+        if action == 'ready_for_review':
+            return 'pull_request_ready_for_review'
         # Unsupported pull_request events
         if action in ('labeled', 'unlabeled', 'review_request_removed'):
             return None