Add Django 2.2 and drop Django 2.0 support

Signed-off-by: Aleksi Häkli <aleksi.hakli@iki.fi>

.travis.yml

@@ -6,8 +6,8 @@ python:
   - 3.7
 env:
   - DJANGO=1.11
-  - DJANGO=2.0
   - DJANGO=2.1
+  - DJANGO=2.2
   - DJANGO=master
 matrix:
   allow_failures:

setup.py

@@ -44,8 +44,8 @@ setup(
         'Environment :: Web Environment',
         'Framework :: Django',
         'Framework :: Django :: 1.11',
-        'Framework :: Django :: 2.0',
         'Framework :: Django :: 2.1',
+        'Framework :: Django :: 2.2',
         'Intended Audience :: Developers',
         'Intended Audience :: System Administrators',
         'License :: OSI Approved :: MIT License',

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 envlist =
-    py{36,37}-django{111,20,21,master}
+    py{36,37}-django{111,21,22,master}
 
 [travis]
 python =
@@ -10,15 +10,14 @@ python =
 [travis:env]
 DJANGO =
     1.11: django111
-    2.0: django20
     2.1: django21
+    2.2: django22
     master: djangomaster
 
 [testenv]
 deps =
     -r requirements.txt
     django111: django>=1.11,<2.0
-    django20: django>=2.0,<2.1
     django21: django>=2.1,<2.2
     djangomaster: https://github.com/django/django/archive/master.tar.gz
 usedevelop = True