Update CHANGES.txt for TEZ-3223. (hitesh)
Update CHANGES.txt for TEZ-3223. (hitesh)

apache/tez,apache/tez,ChetnaChaudhari/tez,apache/tez,sidseth/tez,ueshin/apache-tez,ueshin/apache-tez,sidseth/tez,sidseth/tez,ueshin/apache-tez,ChetnaChaudhari/tez,ChetnaChaudhari/tez,apache/tez,ueshin/apache-tez,ChetnaChaudhari/tez,apache/tez,sidseth/tez,ChetnaChaudhari/tez,ueshin/apache-tez,sidseth/tez