Moved HADOOP-8419 in CHANGES.txt from 3.0.0 to 2.8.0.

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -1331,6 +1331,8 @@ Release 2.8.0 - UNRELEASED
 
     HADOOP-12567: NPE in SaslRpcServer (Sergey Shelukhin via cnauroth)
 
+    HADOOP-8419. Fixed GzipCode NPE reset for IBM JDK. (Yu Li via eyang)
+
   OPTIMIZATIONS
 
     HADOOP-12051. ProtobufRpcEngine.invoke() should use Exception.toString()