add codecov to travis

Author: saxix

.travis.yml

@@ -11,15 +11,25 @@ python:
 
 install:
   - pip install .
-  - pip install tox
+  - pip install tox coverage codecov
   - "TOX_ENV=${TRAVIS_PYTHON_VERSION/[0-9].[0-9]/py${TRAVIS_PYTHON_VERSION/.}}"
 
 
 branches:
   only:
+    - master
     - develop
     - feature/travis
 
+
+before_success:
+  - coverage erase
+
+
+after_success:
+  - coverage combine
+  - codecov
+
 script: tox -e $TOX_ENV
 
 before_cache: