Added django 3.0 to test matrix (#613)

Author: Ross Mechanic

.travis.yml

@@ -15,7 +15,7 @@ env:
   - DJANGO="Django>=2.0,<2.1"
   - DJANGO="Django>=2.1,<2.2"
   - DJANGO="Django>=2.2,<2.3"
-  - DJANGO="Django==3.0rc1"
+  - DJANGO="Django>=3.0,<3.1"
 
 install:
   - pip install -U coverage codecov
@@ -50,10 +50,10 @@ matrix:
     - python: 3.4
       env: DJANGO="Django>=2.2,<2.3"
     - python: 2.7
-      env: DJANGO="Django==3.0rc1"
+      env: DJANGO="Django>=3.0,<3.1"
     - python: 3.4
-      env: DJANGO="Django==3.0rc1"
+      env: DJANGO="Django>=3.0,<3.1"
     - python: 3.5
-      env: DJANGO="Django==3.0rc1"
+      env: DJANGO="Django>=3.0,<3.1"
 
 after_success: codecov

tox.ini

@@ -4,6 +4,7 @@ envlist =
     py{34,35,36,37}-django20,
     py{35,36,37}-django21,
     py{35,36,37,38}-django22,
+    py{36,37,38}-django30,
     py{36,37,38}-djangotrunk,
     docs, flake8