updated changelog for release

changelog.html

@@ -54,6 +54,11 @@ 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=v1.646>What's new in 1.646</a> (2016/01/25)</h3>
 <ul class=image>
   <li class="major RFE">
     The official parent POM for plugins is now hosted in the <code>plugin-pom</code> repository, starting with version 2.0.
@@ -62,7 +67,6 @@ Upcoming changes</a>
     Under some conditions a build record could be loaded twice, leading to erratic behavior.
     (<a href="https://issues.jenkins-ci.org/browse/JENKINS-22767">issue 22767</a>)
 </ul>
-</div><!--=TRUNK-END=-->
 <h3><a name=v1.645>What's new in 1.645</a> (2016/01/18)</h3>
 <ul class=image>
   <li class="bug">