Update README.md

Author: sbromberger

README.md

@@ -2,6 +2,4 @@
 
 [![Build Status](https://travis-ci.org/sbromberger/CommunityDetection.jl.svg?branch=master)](https://travis-ci.org/sbromberger/CommunityDetection.jl)
 
-[![Coverage Status](https://coveralls.io/repos/sbromberger/CommunityDetection.jl/badge.svg?branch=master&service=github)](https://coveralls.io/github/sbromberger/CommunityDetection.jl?branch=master)
-
 [![codecov.io](http://codecov.io/github/sbromberger/CommunityDetection.jl/coverage.svg?branch=master)](http://codecov.io/github/sbromberger/CommunityDetection.jl?branch=master)