updated changelog for release

changelog.html

@@ -54,6 +54,11 @@ Upcoming changes</a>
 
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+<h3><a name=v1.618>What's new in 1.618</a> (2015/06/29)</h3>
 <ul class=image>
   <li class=bug>
     Fix deadlock in hudson.model.Executor.
@@ -87,7 +92,6 @@ Upcoming changes</a>
     Always use earlier start time when merging two equivalent queue items.
     (<a href="https://issues.jenkins-ci.org/browse/JENKINS-2180">issue 2180</a>)
 </ul>
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 <h3><a name=v1.617>What's new in 1.617</a> (2015/06/07)</h3>
 <ul class=image>
   <li class=bug>