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: d73bed7a81999817a196aba33a7c8fb55e1b3ecc
  1. src/
  2. pom.xml