Enable tests for Django 2.0, 2.1, 2.2 and 3.0

Author: Kevin Michel

tox.ini

@@ -1,6 +1,10 @@
 [tox]
 envlist =
-    py{27,34,35,36,37,38}
+    py{27,34,35,36,37,38}-django111
+    py{34,35,36,37}-django20
+    py{35,36,37}-django21
+    py{35,36,37,38}-django22
+    pu{36,37,38}-django30
     py{35,36,37,38}-aiohttp2
     coverage-report
 
@@ -18,7 +22,11 @@ deps =
     Flask-SQLAlchemy
     future
     # the sdk doesn't support earlier version of django
-    django >= 1.10, <2.0
+    django111: django >= 1.10, <2.0
+    django20: django >= 2.0, <2.1
+    django21: django >= 2.1, <2.2
+    django22: django >= 2.2, <3.0
+    django30: django >= 3.0, <4.0
     django-fake-model
     pynamodb >= 3.3.1
     psycopg2