HDFS-5406. Update CHANGES.txt

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1556085 13f79535-47bb-0310-9956-ffa450edef68

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -383,6 +383,9 @@ BREAKDOWN OF HDFS-2832 SUBTASKS AND RELATED JIRAS
     HDFS-5454. DataNode UUID should be assigned prior to FsDataset
     initialization. (Arpit Agarwal)
 
+    HDFS-5406. Send incremental block reports for all storages in a
+    single call. (Arpit Agarwal)
+
 Release 2.3.0 - UNRELEASED
 
   INCOMPATIBLE CHANGES