Changing badge to codecov

README.md

@@ -2,7 +2,7 @@
 
 [![TravisCI Status](https://travis-ci.org/obspy/obspy.svg?branch=master)](https://travis-ci.org/obspy/obspy)
 [![AppVeyor Status](https://ci.appveyor.com/api/projects/status/xqrbaj9phjm6l2vw/branch/master?svg=true)](https://ci.appveyor.com/project/obspy/obspy)
-[![Coverage Status](https://img.shields.io/coveralls/obspy/obspy.svg)](https://coveralls.io/r/obspy/obspy?branch=master)
+[![Coverage Status](https://codecov.io/gh/obspy/obspy/branch/master/graph/badge.svg)](https://codecov.io/gh/obspy/obspy)
 [![PyPI Version](https://img.shields.io/pypi/v/obspy.svg)](https://pypi.python.org/pypi/obspy)
 [![Supported Python versions](https://img.shields.io/pypi/pyversions/obspy.svg)](https://pypi.python.org/pypi/obspy/)
 [![License](https://img.shields.io/pypi/l/obspy.svg)](https://pypi.python.org/pypi/obspy/)