Add the Codecov badge for master

brettcannon · web-flow · commit aa2a621c8bb4 · 2017-02-10T14:33:55.000-08:00
diff --git a/.github/CONTRIBUTING.rst b/.github/CONTRIBUTING.rst
@@ -8,6 +8,9 @@ Build Status
 
   + .. image:: https://travis-ci.org/python/cpython.svg?branch=master
        :target: https://travis-ci.org/python/cpython
+  + .. image:: https://codecov.io/gh/python/cpython/branch/master/graph/badge.svg
+       :target: https://codecov.io/gh/python/cpython
+
   + `Stable buildbots <http://buildbot.python.org/3.x.stable/>`_
 
 - 3.6
