docs: added travis badge to readme.

README.md

@@ -2,6 +2,7 @@
 
 [![License](http://img.shields.io/:license-apache-blue.svg?style=flat-square)](http://www.apache.org/licenses/LICENSE-2.0.html)
 [![Semantic Versioning](https://img.shields.io/SemVer/2.0.0.png)](http://semver.org/spec/v2.0.0.html)
+[![Build Status](https://travis-ci.org/Syncleus/aparapi.svg?branch=master)](https://travis-ci.org/Syncleus/aparapi)
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.aparapi/aparapi/badge.png?style=flat)](https://maven-badges.herokuapp.com/maven-central/com.aparapi/aparapi/)
 [![Javadocs](http://www.javadoc.io/badge/com.aparapi/aparapi.svg)](http://www.javadoc.io/doc/com.aparapi/aparapi)
 [![Gitter](https://badges.gitter.im/Syncleus/aparapi.svg)](https://gitter.im/Syncleus/aparapi?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)