Merge pull request #21 from ccnmtl/django-2.0

Test on django 2.0

Author: nbuonin

.travis.yml

@@ -6,8 +6,13 @@ python:
 env:
 - DJANGO="Django>=1.8.0,<1.9.0"
 - DJANGO="Django>=1.11,<1.12.0"
+- DJANGO="Django>=2.0,<2.1"
+matrix:
+  exclude:
+  - python: '2.7'
+    env: DJANGO="Django>=2.0,<2.1"
 install:
-- pip install .
+- pip install $DJANGO
 - pip install flake8
 - pip install coveralls
 script: