updated changelog for release

changelog.html

@@ -61,7 +61,10 @@ Upcoming changes</a>
 
 <!-- these changes are controlled by the release process. DO NOT MODIFY -->
 <div id="rc" style="display:none;"><!--=BEGIN=-->
-<h3><a name=v1.598>What's new in 1.598</a> <!--=DATE=--></h3>
+<h3><a name=v1.599>What's new in 1.599</a> <!--=DATE=--></h3>
+<!--=RC-CHANGES=-->
+</div><!--=END=-->
+<h3><a name=v1.598>What's new in 1.598</a> (2015/01/25)</h3>
 <ul class=image>
   <li class='major bug'>
     Build format change migrator in 1.597 did not work on some Windows systems.
@@ -110,7 +113,6 @@ Upcoming changes</a>
     (<a href="https://issues.jenkins-ci.org/browse/JENKINS-25455">issue 25455</a>,
      <a href="https://issues.jenkins-ci.org/browse/JENKINS-23151">issue 23151</a>)
 </ul>
-</div><!--=END=-->
 <h3><a name=v1.597>What's new in 1.597</a> (2015/01/19)</h3>
 <ul class=image>
   <li class='major rfe'>