Add codecov badge
Let's show off our coverage
Welcome to Read the Docs
========================
-|build-status| |docs|
+|build-status| |docs| |coverage|
Purpose
-------
@@ -70,6 +70,11 @@ when you push to GitHub.
:scale: 100%
:target: https://docs.readthedocs.io/en/latest/?badge=latest
+.. |coverage| image:: https://codecov.io/gh/rtfd/readthedocs.org/branch/master/graph/badge.svg
+ :alt: Test coverage
+ :scale: 100%
+ :target: https://codecov.io/gh/rtfd/readthedocs.org
+
License
-------
