Fixed #373

 - Added link to published JavaDoc to javadoc.io

Author: khmarbaise

README.md

@@ -3,6 +3,7 @@
 [![MIT Licence](https://img.shields.io/github/license/jenkinsci/java-client-api.svg?label=License)](http://opensource.org/licenses/MIT)
 [![Maven Central](https://img.shields.io/maven-central/v/com.offbytwo.jenkins/jenkins-client.svg?label=Maven%20Central)](http://search.maven.org/#search%7Cga%7C1%7Cg%3A%22com.offbytwo.jenkins%22%20a%3A%22jenkins-client%22)
 [![Build Status](https://travis-ci.org/jenkinsci/java-client-api.svg?branch=master)](https://travis-ci.org/jenkinsci/java-client-api)
+[![Javadocs](https://javadoc.io/badge/com.offbytwo.jenkins/jenkins-client.svg?color=blue)](https://javadoc.io/doc/com.offbytwo.jenkins/jenkins-client)
 
 ## Important Note