Add HDFS-4046 to Release 2.0.3 section

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1406019 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -451,6 +451,9 @@ Release 2.0.3-alpha - Unreleased
     HDFS-4143. Change blocks to private in INodeFile and renames isLink() to
     isSymlink() in INode. (szetszwo)
 
+    HDFS-4046. Rename ChecksumTypeProto enum NULL since it is illegal in
+    C/C++. (Binglin Chang via suresh)
+
   OPTIMIZATIONS
 
   BUG FIXES