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

tinesoft/appengine-maven-plugin,ArcBees/appengine-maven-plugin,josephburnett/appengine-maven-plugin,GoogleCloudPlatform/appengine-maven-plugin,ludoch/appengine-maven-plugin,RajMondaz/appengine-maven-plugin