[maven-release-plugin] prepare for next development iteration
[maven-release-plugin] prepare for next development iteration

PeterKnego/appengine-maven-plugin-oath2-config,ludoch/appengine-maven-plugin,ArcBees/appengine-maven-plugin,GoogleCloudPlatform/appengine-maven-plugin,rdwallis/appengine-maven-plugin,tinesoft/appengine-maven-plugin,renfeng/appengine-maven-plugin,RajMondaz/appengine-maven-plugin,kuldeep0709/appengine-maven-plugin,josephburnett/appengine-maven-plugin