codecov badge in readme

Author: phobson

README.md

@@ -2,7 +2,8 @@
 Real probability scales for matplotlib
 
 [![Build Status](https://travis-ci.org/phobson/mpl-probscale.svg)](https://travis-ci.org/phobson/mpl-probscale)
-[![Coverage Status](https://coveralls.io/repos/phobson/mpl-probscale/badge.svg?branch=master&service=github)](https://coveralls.io/github/phobson/mpl-probscale?branch=master)
+[![codecov](https://codecov.io/gh/phobson/mpl-probscale/branch/master/graph/badge.svg)](https://codecov.io/gh/phobson/mpl-probscale)
+
 
 [Sphinx Docs](http://phobson.github.io/mpl-probscale/)