use plugin:available instead of the old jelly script (bugged)

git-svn-id: https://svn.apache.org/repos/asf/maven/maven-1/plugins/trunk@289263 13f79535-47bb-0310-9956-ffa450edef68

jdiff/xdocs/changes.xml

@@ -2,7 +2,7 @@
 
 <!-- 
 /*
- * Copyright 2001-2004 The Apache Software Foundation.
+ * Copyright 2001-2005 The Apache Software Foundation.
  * 
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -24,6 +24,9 @@
     <author email="evenisse@ifrance.com">Emmanuel Venisse</author>
   </properties>
   <body>
+    <release version="1.6-SNAPSHOT" date="In SVN">
+      <action dev="aheritier" type="update">It requires at least maven-plugin-plugin v1.7.</action>
+    </release>
     <release version="1.5" date="2005-09-06">
       <action dev="brett" type="fix" issue="MPJDIFF-2">Add the classpath to the Javadoc tag to properly resolve classes</action>
       <action dev="brett" type="update" issue="MPJDIFF-4">Store difference XML files in the