updated release notes

docs/docs/release_notes.xml

@@ -11,6 +11,19 @@
 <!-- **************************************************************************************  -->
 
 <current>
+New Features:
+
+Non-Backwards Compatible Changes:
+
+Bug fixes:
+
+Other:
+
+</current>
+
+<!-- **************************************************************************************  -->
+
+<old name="18.3" date="June 10, 2013">
 New Features:
    - Machine Learning:
       - Added the svr_linear_trainer, a tool for solving large scale support vector 
@@ -41,7 +54,7 @@ Other:
    - The machine learning page now contains a flow chart to help new users
      select a machine learning tool appropriate for their task.
 
-</current>
+</old>
 
 <!-- **************************************************************************************  -->