[maven-release-plugin] prepare release maven-launchpad-plugin-2.3.0

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1573466 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1573468 13f79535-47bb-0310-9956-ffa450edef68