Update dev requirements versions

.travis.yml

@@ -9,22 +9,22 @@ python:
 env:
   - DJANGO_VERSION=1.9.13
   - DJANGO_VERSION=1.10.8
-  - DJANGO_VERSION=1.11.20
+  - DJANGO_VERSION=1.11.21
   - DJANGO_VERSION=2.0.13
-  - DJANGO_VERSION=2.1.8
-  - DJANGO_VERSION=2.2
+  - DJANGO_VERSION=2.1.9
+  - DJANGO_VERSION=2.2.2
 matrix:
   exclude:
   - python: 2.7
     env: DJANGO_VERSION=2.0.13
   - python: 2.7
-    env: DJANGO_VERSION=2.1.8
+    env: DJANGO_VERSION=2.1.9
   - python: 3.4
-    env: DJANGO_VERSION=2.1.8
+    env: DJANGO_VERSION=2.1.9
   - python: 2.7
-    env: DJANGO_VERSION=2.2
+    env: DJANGO_VERSION=2.2.2
   - python: 3.4
-    env: DJANGO_VERSION=2.2
+    env: DJANGO_VERSION=2.2.2
 install:
   - pip install -r dev-env-requirements.txt
   - pip install django==$DJANGO_VERSION

dev-env-requirements.txt

 -r requirements.txt
 graphene==2.1.3
 graphene-django==2.2.0
-pytest==4.4.1
-pytest-django==3.4.8
-pytest-cov==2.6.1
+pytest==4.6.3
+pytest-django==3.5.0
+pytest-cov==2.7.1
 flake8==3.7.7
 mock==2.0.0

dev-requirements.txt

 -r dev-env-requirements.txt
-django==2.2
+django==2.2.2

setup.py

@@ -43,5 +43,6 @@ setup(
         'Framework :: Django :: 1.11',
         'Framework :: Django :: 2.0',
         'Framework :: Django :: 2.1',
+        'Framework :: Django :: 2.2',
     ],
 )