Fixed badge for Maven

Author: rijnb

README.md

@@ -3,7 +3,7 @@
 [![Build Status](https://img.shields.io/travis/mapcode-foundation/mapcode-java.svg)](https://travis-ci.org/mapcode-foundation/mapcode-java)
 [![Coverage Status](https://coveralls.io/repos/github/mapcode-foundation/mapcode-java/badge.svg)](https://coveralls.io/github/mapcode-foundation/mapcode-java)
 [![Release](https://img.shields.io/github/release/mapcode-foundation/mapcode-java.svg)](https://github.com/mapcode-foundation/mapcode-java/releases)
-[![Maven Central](https://img.shields.io/maven-central/v/com.mapcode/mapcode-java.svg)](https://maven-badges.herokuapp.com/maven-central/com.mapcode/mapcode-java)
+[![Maven Central](https://img.shields.io/maven-central/v/com.mapcode/mapcode.svg)](https://maven-badges.herokuapp.com/maven-central/com.mapcode/mapcode)
 
 **Copyright (C) 2014-2016 Stichting Mapcode Foundation (http://www.mapcode.com)**