fixup! Try to enforce a C standard from after I was born

Author: mundya

.travis.yml

@@ -23,11 +23,12 @@ script:
   - make coverage
   - cd -
   # Then check that the package can be built, and run the Python tests
+  - CFLAGS="$CFLAGS --std=gnu99"
   - python setup.py develop
   - >
       py.test py_tests \
               --cov rig_routing_tables \
-              --cov tests
+              --cov py_tests
   - flake8 rig_routing_tables py_tests
 
 after_success: