Update README.md

Author: brettwooldridge

README.md

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+[![][Build Status img]][Build Status]
+[![][license img]][license]
+[![][Maven Central img]][Maven Central]
+[![][Javadocs img]][Javadocs]
+
 jnr-unixsocket
 ==============
 
 Native I/O access for java.
 
 Check out the [examples](https://github.com/jnr/jnr-unixsocket/tree/master/src/test/java/jnr/unixsocket/example) for more information.
 
+[Build Status]:https://travis-ci.org/jnr/jnr-unixsocket
+[Build Status img]:https://travis-ci.org/jnr/jnr-unixsocket.svg?branch=master
+
+[license]:LICENSE
+[license img]:https://img.shields.io/badge/license-Apache%202-blue.svg
+
+[Maven Central]:https://maven-badges.herokuapp.com/maven-central/com.github.jnr/jnr-unixsocket
+[Maven Central img]:https://maven-badges.herokuapp.com/maven-central/com.github.jnr/jnr-unixsocket/badge.svg
+
+[Javadocs]:http://javadoc.io/doc/com.github.jnr/jnr-unixsocket
+[Javadocs img]:http://javadoc.io/badge/com.github.jnr/jnr-unixsocket.svg