Update CHANGES.txt again for 1.5.0 RC4
diff --git a/CHANGES.txt b/CHANGES.txt
index 819c673..c9bd940 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -109,6 +109,7 @@
     * [HBASE-23086] - TestShell failing on branch-1 and branch-1.4
     * [HBASE-23094] - Wrong log message in simpleRegionNormaliser while checking if merge is enabled.
     * [HBASE-23128] - Restore Region interface compatibility
+    * [HBASE-23139] - MapReduce jobs lauched from convenience distribution are nonfunctional
 
 ** New Feature
     * [HBASE-15666] - shaded dependencies for hbase-testing-util