Update CHANGES.txt to move MR-6059 to 2.7

hadoop-mapreduce-project/CHANGES.txt

@@ -94,8 +94,6 @@ Trunk (Unreleased)
     MAPREDUCE-6013. [post-HADOOP-9902] mapred version is missing (Akira AJISAKA
     via aw)
 
-    MAPREDUCE-6059. Speed up history server startup time (Siqi Li via aw)
-
   BUG FIXES
 
     MAPREDUCE-6191. Improve clearing stale state of Java serialization
@@ -282,6 +280,8 @@ Release 2.7.0 - UNRELEASED
     from key and value at the end of the iteration to save memory. 
     (Zhihai Xu via kasha)
 
+    MAPREDUCE-6059. Speed up history server startup time (Siqi Li via aw)
+
   BUG FIXES
 
     MAPREDUCE-6210. Use getApplicationAttemptId() instead of getApplicationId()