Update README.md

Author: Javen

README.md

@@ -1,5 +1,6 @@
 [![Build Status](https://travis-ci.org/jpush/jpush-api-java-client.svg?branch=master)](https://travis-ci.org/jpush/jpush-api-java-client)
 [![Dependency Status](https://www.versioneye.com/user/projects/53eff13a13bb06f0bb000518/badge.svg?style=flat)](https://www.versioneye.com/user/projects/53eff13a13bb06f0bb000518)
+[![GitHub version](https://badge.fury.io/gh/jpush%2Fjpush-api-java-client.svg)](http://badge.fury.io/gh/jpush%2Fjpush-api-java-client)
 
 # JPush API Java Library