updated changelog for release

changelog.html

@@ -55,8 +55,12 @@ Upcoming changes</a>
 
 <!-- Record your changes in the trunk here. -->
 <div id="trunk" style="display:none"><!--=TRUNK-BEGIN=-->
-
+<ul class=image>
+  <li class=>
+</ul>
 </div><!--=TRUNK-END=-->
+<h3><a name=v2.1>What's new in 2.1</a> (2016/05/01)</h3>
+
 <h3><a name=v2.0>What's new in 2.0</a> (2016/04/20)</h3>
 <div style="margin: 10px; padding: 10px; background-color: #FFFFCE;">
   <strong>More detailed information about the new features in Jenkins 2.0 <a href="/2.0/">on the overview page</a>.</strong>