add missing release date

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1440198 13f79535-47bb-0310-9956-ffa450edef68
add diff url for release 24

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1440202 13f79535-47bb-0310-9956-ffa450edef68
fix version

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1440212 13f79535-47bb-0310-9956-ffa450edef68