Bumped version to 2.2 in docs.

docs/conf.py

@@ -79,7 +79,7 @@ copyright = 'Django Software Foundation and contributors'
 # built documents.
 #
 # The short X.Y version.
-version = '2.1'
+version = '2.2'
 # The full version, including alpha/beta/rc tags.
 try:
     from django import VERSION, get_version
@@ -95,7 +95,7 @@ else:
     release = django_release()
 
 # The "development version" of Django
-django_next_version = '2.1'
+django_next_version = '2.2'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.