Changelog updated

documentation/changelog.html

@@ -59,6 +59,7 @@
   <li>Exercises: Fixing question list order #2075</li>
   <li>Exercises: Allowing duplicate an exercise within a session BT#1647</li>
   <li>Exercises: Improving pagination when browsing exercise results (private task BT#1901)</li>
+  <li>Exercises: Question Pool improvements: now we can copy a question from other courses see BT#1917</li>
   <li>Documents: Fixing coach and students in a session permissions BT#1652</li>
   <li>Learning Path: Teachers can reset LP results see #2024</li>
   <li>Learning Path: Fixing bug when deleting a LP item that have prerequisites in other itels see #1756</li>