updated changelog for release

changelog.html

@@ -54,12 +54,16 @@ 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=v1.620>What's new in 1.620</a> (2015/07/12)</h3>
 <ul class=image>
   <li class=bug>
     Display system info even when slave is temporarily offline.
     (<a href="https://issues.jenkins-ci.org/browse/JENKINS-29300">issue 29300</a>)
 </ul>
-</div><!--=TRUNK-END=-->
 <h3><a name=v1.619>What's new in 1.619</a> (2015/07/05)</h3>
 <ul class=image>
   <li class=bug>