Updated docs

Author: rozza

_includes/themes/mongoengine/frontpage.html

@@ -51,10 +51,9 @@ <h1 class="logo">MongoEngine</h1>
 {% endhighlight %}
       </div>
       <div class="tab-pane" id="announcements">
-          <h3>v0.6.11 Released</h3>
+          <h3>v0.6.13 Released</h3>
           <p>
-            Multiple minor fixes and a new reverse_delete_rule (PULL).
-            See the <a href="http://mongoengine-odm.readthedocs.org/en/latest/changelog.html#changes-in-0-6-11">change log</a> for a full list of changes.
+            More minor updates - see the <a href="http://mongoengine-odm.readthedocs.org/en/latest/changelog.html#changes-in-0-6-13">change log</a> for a full list of changes.
           </p>
           <h3>Roadmap released</h3>
           <p>