requirements: Upgrade mypy to 0.570.

Fixes #8582.

requirements/dev.txt

@@ -87,7 +87,7 @@ markdown==2.6.11
 markupsafe==1.0
 mock==2.0.0
 moto==1.2.0
-mypy==0.560
+mypy==0.570
 mypy_extensions==0.3.0
 ndg-httpsclient==0.4.4
 oauth2client==4.1.2
@@ -106,7 +106,6 @@ pip-tools==1.11.0
 polib==1.1.0
 premailer==3.1.1
 prompt-toolkit==1.0.15    # via ipython
-psutil==5.4.1             # via mypy
 psycopg2==2.7.4
 ptyprocess==0.5.2         # via pexpect
 py3dns==3.1.0

requirements/mypy.in

@@ -2,7 +2,7 @@
 # /tools/update-locked-requirements to update requirements/dev.txt
 # and requirements/mypy.txt.
 # See requirements/README.md for more detail.
-mypy==0.560
+mypy==0.570
 
 # Include typing explicitly, since it's needed on Python 3.4
 typing==3.6.4

requirements/mypy.txt

@@ -7,7 +7,6 @@
 #
 # For details, see requirements/README.md .
 #
-mypy==0.560
-psutil==5.4.1             # via mypy
+mypy==0.570
 typed-ast==1.1.0          # via mypy
 typing==3.6.4

version.py

@@ -8,4 +8,4 @@ ZULIP_VERSION = "1.7.1+git"
 # Typically, adding a dependency only requires a minor version bump, and
 # removing a dependency requires a major version bump.
 
-PROVISION_VERSION = '15.7'
+PROVISION_VERSION = '15.8'