Make sure coveralls is functioning.

.coveragerc

@@ -0,0 +1,6 @@
+[run]
+source = postnl_checkout
+branch = True
+
+[report]
+omit = postnl_checkout/django_postnl_checkout/migrations/*

.travis.yml

@@ -28,9 +28,10 @@ install:
   - pip install -r requirements_django.txt
   - pip install -q $DJANGO
   - pip install -r requirements_test.txt
+  - pip install coveralls
 
 # command to run tests
-script: python setup.py test
+script: coverage run setup.py test
 
 # submit coverage reports
 after_success: