updated changelog for release

changelog.html

@@ -55,6 +55,11 @@ 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=v2.8>What's new in 2.8</a> (2016/06/05)</h3>
 <ul class=image>
   <li class=bug>
     Explicitly declare compatibility of Windows build agent service with .NET Framework 4.
@@ -83,7 +88,6 @@ Upcoming changes</a>
     to the proxy validation logic.
     (<a href="https://github.com/jenkinsci/jenkins/pull/1955">PR #1955</a>)
 </ul>
-</div><!--=TRUNK-END=-->
 <h3><a name=v2.7>What's new in 2.7</a> (2016/05/29)</h3>
 <ul class=image>