Updated README
Updated README

Changed version in maven dependency tag (was 0.2.0, now 0.3.0)
khmarbaise/jenkins-client,rhels/jenkins-client,shenhuarj/jenkins-client,JasmeenKaur19/jenkins-client,terabyte/jenkins-client,RisingOak/jenkins-client,aerogear/java-client-api,liuz7/java-client-api,aerogear/java-client-api,mass/jenkins-client,akarnani/jenkins-client,hamaron/jenkins-client,pnathan/jenkins-client,liuz7/java-client-api