IFTTT allows custom templating for their payloads, so the onus is
on the user to ensure that their custom templates conform to the
expectations outlined in our IFTTT webhook docs. For that reason,
these payloads weren't generated, but were manually edited.
All webhook fixtures in zerver/fixtures/<webhook_name> have now
been moved to dedicated webhook-specific directories under
zerver/webhooks/<webhook_name>/fixtures, where <webhook_name> is
the name of the webhook.
Alex Vandiver
Eeshan Garg
neiljp (Neil Pilgrim)