Minor - Added a few lines to changelog

documentation/changelog.html

@@ -51,7 +51,9 @@
 <p><a href="http://en.wikipedia.org/wiki/Mystery">Mystery</a> is a name we give new versions before we know their name. </p>
 <h3>New Features</h3>
 <ul>
-  <li></li>
+  <li>Documents gallery now creates thumbnails to speed rendering up (#4536)</li>
+  <li>New "Impress" visualization for learning paths (#4595)</li>
+  <li>Show weight of current teacher's documents in session (#5298)</li>
 </ul>
 <h3>Improvements</h3>
 <ul>