use released version of plugin parent, i.e 28

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1710222 13f79535-47bb-0310-9956-ffa450edef68
1 file changed
tree: f8e12570aefd13a58d1a204eb79229a10f10a882
  1. pom.xml
  2. src/