Merge pull request #42 from codacy-badger/codacy-badge-2

Add a Codacy badge to README.md

README.md

@@ -1,6 +1,7 @@
 [![Codacy Badge](https://api.codacy.com/project/badge/Grade/1e6f0cbe65dc4a57a1c1769248956018)](https://app.codacy.com/app/FedorSmirnov89/opt4j?utm_source=github.com&utm_medium=referral&utm_content=felixreimann/opt4j&utm_campaign=badger)
 [![Build Status](https://travis-ci.org/felixreimann/opt4j.svg?branch=master)](https://travis-ci.org/felixreimann/opt4j)
-[![Coverage Status](https://coveralls.io/repos/github/felixreimann/opt4j/badge.svg?branch=master)](https://coveralls.io/github/felixreimann/opt4j?branch=master)
+[![Codacy Badge](https://api.codacy.com/project/badge/Grade/324a853969fa45d1871d6e764e24fe37)](https://app.codacy.com/app/felixreimann/opt4j?utm_source=github.com&utm_medium=referral&utm_content=felixreimann/opt4j&utm_campaign=badger)
+[![Codacy Badge](https://api.codacy.com/project/badge/Coverage/1079b342eee541c3b843d01c293c880b)](https://www.codacy.com/app/felixreimann/opt4j?utm_source=github.com&utm_medium=referral&utm_content=felixreimann/opt4j&utm_campaign=Badge_Coverage)
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/org.opt4j/opt4j-core/badge.svg)](https://maven-badges.herokuapp.com/maven-central/org.opt4j/opt4j-core)
 [![Javadocs](https://javadoc.io/badge/org.opt4j/opt4j-core.svg)](https://javadoc.io/doc/org.opt4j/opt4j-core)