Enforce successful upload of coverage files codecov (django-json-api#530)

Author: sliverc

.gitignore

@@ -34,6 +34,7 @@ pip-delete-this-directory.txt
 
 # Coverage
 .coverage
+coverage.xml
 
 # Tox
 .tox/

.travis.yml

@@ -100,4 +100,4 @@ script:
   - tox
 after_success:
   - pip install codecov
-  - codecov -e TOXENV
+  - codecov -e TOXENV --required

tox.ini

@@ -24,7 +24,7 @@ setenv =
     DJANGO_SETTINGS_MODULE=example.settings.test
 
 commands =
-    python setup.py test --addopts '--cov --no-cov-on-fail' {posargs}
+    python setup.py test --addopts '--cov --no-cov-on-fail --cov-report xml' {posargs}
 
 [testenv:flake8]
 deps =