PIG-34: cleaned up CHANGES.txt
PIG-34: cleaned up CHANGES.txt

git-svn-id: 226b8f141f0291a1248c1084c82e74d4711db920@675711 13f79535-47bb-0310-9956-ffa450edef68

apache/pig,apache/pig,apache/pig,apache/pig,apache/pig,apache/pig,apache/pig