TAJO-38 Update CHANGES.txt file.
TAJO-38 Update CHANGES.txt file.

apache/incubator-tajo,hyunsik/incubator-tajo,gruter/tajo-cdh,hyunsik/incubator-tajo,hyunsik/incubator-tajo,gruter/tajo-cdh,yeeunshim/tajo_test,gruter/tajo-cdh,hyunsik/incubator-tajo,yeeunshim/tajo_test,yeeunshim/tajo_test,apache/incubator-tajo,apache/incubator-tajo,yeeunshim/tajo_test,gruter/tajo-cdh,apache/incubator-tajo