Update the django version in travis.yml

Missed updating the version of Django in travis.yml. Will take care of
it in next commits

.travis.yml

@@ -45,7 +45,7 @@ install:
 
   # Install the CI dependencies
   - python -m pip install celery==3.1.20  # pin from requirements.txt
-  - python -m pip install Django==1.9  # pin from requirements.txt
+  - python -m pip install Django==1.10  # pin from requirements.txt
   - python -m pip install nox
   - python -m pip install coveralls