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: e4e8a8ef33bc4cc34959ee2d43d0c92f0778e719
  1. src/
  2. pom.xml