Preparing for 0.19 development

git-svn-id: https://svn.apache.org/repos/asf/hadoop/core/trunk@664226 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -1,5 +1,16 @@
 Hadoop Change Log
 
+Trunk (unreleased changes)
+
+  INCOMPATIBLE CHANGES
+
+  NEW FEATURES
+
+  IMPROVEMENTS
+
+  OPTIMIZATIONS
+
+  BUG FIXES
 
 Release 0.18.0 - Unreleased