opennlp-1.6.0-rc6
[maven-release-plugin] copy for tag opennlp-1.6.0-rc6

git-svn-id: https://svn.apache.org/repos/asf/opennlp/tags/opennlp-1.6.0-rc6@1685830 13f79535-47bb-0310-9956-ffa450edef68