Add Django 2.2

Author: jayvdb

.travis.yml

@@ -12,8 +12,12 @@ matrix:
       env: TOX_ENVS=py35-django111,py35-django20,py35-django20,py35-django21
     - python: "3.6"
       env: TOX_ENVS=py36-django111,py36-django20,py36-django21
+    - python: "3.6"
+      dist: xenial
+      sudo: true
+      env: TOX_ENVS=py36-django22
     - python: "3.7"
-      env: TOX_ENVS=py37-django20,py37-django21
+      env: TOX_ENVS=py37-django20,py37-django21,py37-django22
       dist: xenial
       sudo: true
 before_script:

tox.ini

@@ -5,6 +5,7 @@ envlist =
     py{27,34,35,36}-django111,
     py{34,35,36}-django20,
     py{35,36,37}-django21,
+    py{35,36,37}-django22,
 
 [testenv:flake8]
 deps = flake8
@@ -31,6 +32,7 @@ deps =
     django111: Django>=1.11,<2.0
     django20: Django>=2.0,<2.1
     django21: Django>=2.1,<2.2
+    django22: Django>=2.2,<2.3
     django-nose
     markdown<3.0
     isort