added code coverage badge and reformatted README.rst a bit
@@ -6,6 +6,11 @@ ExpAn: Experiment Analysis
:target: https://travis-ci.org/zalando/expan
:alt: Build status
+.. image:: https://coveralls.io/repos/github/zalando/expan/badge.svg
+ :target: https://coveralls.io/github/zalando/expan
+ :alt: Code coverage
+
+
.. image:: https://img.shields.io/pypi/v/expan.svg
:target: https://pypi.python.org/pypi/expan
:alt: Latest PyPI version
