updated changelog for release

changelog.html

@@ -54,6 +54,11 @@ Upcoming changes</a>
 
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+<h3><a name=v1.649>What's new in 1.649</a> (2016/02/21)</h3>
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     Allow changing the directory used for the extraction of plugin archives via the <code>--pluginroot</code> CLI option (also controllable via the <code>hudson.PluginManager.workDir</code> system property / context parameter. Also document the <code>--webroot</code> CLI parameter in <code>java -jar jenkins.war --help</code>
@@ -65,7 +70,6 @@ Upcoming changes</a>
     ArrayIndexOutOfBoundsException when parsing range set.
     (<a href="https://issues.jenkins-ci.org/browse/JENKINS-32852">issue 32852</a>)
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 <h3><a name=v1.648>What's new in 1.648</a> (2016/02/17)</h3>
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