Add entry to branch's CHANGES.txt for previous commit


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/MR-2841@1613827 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5995. native-task: Revert changes to Text internals. Contributed by Todd Lipcon.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/MR-2841@1613828 13f79535-47bb-0310-9956-ffa450edef68