Use django 2.2 in nox tests

Author: c24t

noxfile.py

@@ -9,10 +9,10 @@
 
 from __future__ import absolute_import
 
-import nox
 import os
 import shutil
 
+import nox
 
 BLACK_VERSION = "black==19.10b0"
 BLACK_PATHS = [
@@ -62,7 +62,9 @@ def lint_setup_py(session):
 
 def default(session):
     # Install all test dependencies, then install this package in-place.
-    session.install("mock", "pytest", "pytest-cov", "django", "mock-import")
+    session.install(
+        "django~=2.2", "mock", "mock-import", "pytest", "pytest-cov"
+    )
     session.install("-e", ".")
 
     # Run py.test against the unit tests.

version.py

@@ -4,4 +4,4 @@
 # license that can be found in the LICENSE file or at
 # https://developers.google.com/open-source/licenses/bsd
 
-__version__ = "3.1.0a1"
+__version__ = "2.2.0a1"