Move HADOOP-5557 change log from 0.18.3 to 0.18.4.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/core/branches/branch-0.20@757911 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -1947,6 +1947,9 @@ Release 0.18.4 - Unreleased
     providing synchronized modification to the counter xmitsInProgress in
     DataNode. (hairong)
 
+    HADOOP-5557. Fixes some minor problems in TestOverReplicatedBlocks.
+    (szetszwo)
+
 Release 0.18.3 - 2009-01-27
 
   IMPROVEMENTS
@@ -2071,9 +2074,6 @@ Release 0.18.3 - 2009-01-27
     HADOOP-4983. Fixes a problem in updating Counters in the status reporting.
     (Amareshwari Sriramadasu via ddas)
 
-    HADOOP-5557. Fixes some minor problems in TestOverReplicatedBlocks.
-    (szetszwo)
-
 Release 0.18.2 - 2008-11-03
 
   BUG FIXES