modified dockerfile for new version 2.2

Author: afischer211

jenkins/jenkins/Dockerfile

@@ -36,9 +36,9 @@ RUN curl -fsSL https://github.com/krallin/tini/releases/download/v0.5.0/tini-sta
 COPY init.groovy /usr/share/jenkins/ref/init.groovy.d/tcp-slave-agent-port.groovy
 
 ARG JENKINS_VERSION
-ENV JENKINS_VERSION ${JENKINS_VERSION:-2.1}
+ENV JENKINS_VERSION ${JENKINS_VERSION:-2.2}
 ARG JENKINS_SHA
-ENV JENKINS_SHA ${JENKINS_SHA:-479476e282eff2b3bae076e81444202356fb0259}
+ENV JENKINS_SHA ${JENKINS_SHA:-ac0b046f477620088fc8e9a40c510e484d975d63}
 
 
 # could use ADD but this one does not check Last-Modified header 

jenkins/jenkins/README.md

@@ -2,8 +2,7 @@
 
 The Jenkins Continuous Integration and Delivery server.
 
-This is a fully functional Jenkins server, based on the Long Term Support release
-[http://jenkins-ci.org/](http://jenkins-ci.org/).
+This is a fully functional Jenkins server, based on the current release [http://jenkins-ci.org/](http://jenkins-ci.org/).
 This image is derived from the official jenkins image at https://hub.docker.com/_/jenkins/ for supporting newer versions (>2.0). The base-code is almost the same.
 
 <img src="http://jenkins-ci.org/sites/default/files/jenkins_logo.png"/>