Run tests on Django 2.2

.travis.yml

@@ -7,14 +7,13 @@ python: "3.6"
 
 env:
   - TOXENV=py27-django111
-  - TOXENV=py34-django111
-  - TOXENV=py34-django20
   - TOXENV=py35-django111
   - TOXENV=py35-django20
   - TOXENV=py35-djangomaster
   - TOXENV=py36-django111
   - TOXENV=py36-django20
   - TOXENV=py36-django21
+  - TOXENV=py36-django22
   - TOXENV=py36-djangomaster
   # XXX: Use a matrix to build these?
   - TOXENV=py36-django111-postgres DB=postgres

runtests.py

@@ -37,12 +37,19 @@ if not settings.configured:
             'django.contrib.auth',
             'django.contrib.contenttypes',
             'django.contrib.messages',
+            'django.contrib.sessions',
             'django.contrib.sites',
             'django.contrib.admin',
             'polymorphic',
             'polymorphic.tests',
         ),
-        MIDDLEWARE_CLASSES=(),
+        MIDDLEWARE = (
+            'django.middleware.common.CommonMiddleware',
+            'django.contrib.sessions.middleware.SessionMiddleware',
+            'django.middleware.csrf.CsrfViewMiddleware',
+            'django.contrib.auth.middleware.AuthenticationMiddleware',
+            'django.contrib.messages.middleware.MessageMiddleware',
+        ),
         SITE_ID=3,
         TEMPLATES=[{
             "BACKEND": "django.template.backends.django.DjangoTemplates",

tox.ini

@@ -3,8 +3,8 @@ envlist =
 	py27-django{111}
 	py34-django{111,20}
 	py35-django{111,20,master}
-	py36-django{111,20,21,master}
-	py37-django{21,master}
+	py36-django{111,20,21,22,master}
+	py37-django{21,22,master}
 	docs
 
 [testenv]
@@ -18,6 +18,7 @@ deps =
 	django111: Django >= 1.11, < 2.0
 	django20: Django ~= 2.0
 	django21: Django ~= 2.1
+	django22: Django ~= 2.2
 	djangomaster: https://github.com/django/django/archive/master.tar.gz
 	postgres: psycopg2
 commands =