updated changelog for release

changelog.html

@@ -54,6 +54,11 @@ Upcoming changes</a>
 
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+<h3><a name=v1.637>What's new in 1.637</a> (2015/11/08)</h3>
 <ul class=image>
   <li class="bug">
     Remove useless warnings about a JDK named <em>null</em>.
@@ -62,7 +67,6 @@ Upcoming changes</a>
     New <tt>OptionalJobProperty</tt> class to simplify <tt>JobProperty</tt> creation.
     (<a href="https://github.com/jenkinsci/jenkins/pull/1888">pull 1888</a>)
 </ul>
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 <h3><a name=v1.636>What's new in 1.636</a> (2015/11/01)</h3>
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   <li class="rfe">