update .travis.yml

Author: jacobwegner

.travis.yml

@@ -1,11 +1,19 @@
+sudo: false
 language: python
-
 python:
-  - 2.7
-
+  - "2.7"
+  - "3.3"
+  - "3.4"
+  - "3.5"
+env:
+  - DJANGO=1.8
+  - DJANGO=1.10
+  - DJANGO=master
+matrix:
+  exclude:
 install:
-  - pip install flake8
-  - pip install -e .
-
+  - pip install tox coveralls
 script:
-  - flake8 .
+  - tox -e py${TRAVIS_PYTHON_VERSION//[.]/}-$DJANGO
+after_success:
+  - coveralls