maven badge in readme

Author: TiarkRompf

README.md

@@ -1,4 +1,8 @@
 [![Build Status](https://api.travis-ci.org/TiarkRompf/virtualization-lms-core.png)](https://travis-ci.org/TiarkRompf/virtualization-lms-core)
+[![Maven Central](https://img.shields.io/maven-central/v/org.scala-lang.lms/lms-core_2.11.svg)](https://maven-badges.herokuapp.com/maven-central/org.scala-lang.lms/lms-core_2.11)
+
+
+https://img.shields.io/maven-central/v/org.scala-lang.lms/lms-core_2.11.svg
 
 Lightweight Modular Staging (LMS) is a runtime code generation approach. 
 This framework, LMS-Core, provides a library of core components for building