YARN-2859 addendum. Re-added the entry to hadoop-yarn/CHANGES.txt under 2.6.3.

hadoop-yarn-project/CHANGES.txt

@@ -12,6 +12,9 @@ Release 2.6.3 - UNRELEASED
 
   BUG FIXES
 
+    YARN-2859. ApplicationHistoryServer binds to default port 8188 in MiniYARNCluster.
+    (Vinod Kumar Vavilapalli via xgong)
+
 Release 2.6.2 - 2015-10-21
 
   INCOMPATIBLE CHANGES