Add missing license headers.
This plugin now passes the checks done by RAT.

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1525338 13f79535-47bb-0310-9956-ffa450edef68
6 files changed
tree: 3304b54d6b25d35d01ca5f82cb70e7d2be9fe600
  1. src/
  2. pom.xml