Add changelog entry

CHANGELOG

@@ -306,6 +306,7 @@ v 7.11.0
   - Protect OmniAuth request phase against CSRF.
   - Don't send notifications to mentioned users that don't have access to the project in question.
   - Add search issues/MR by number
+  - Change plots to bar graphs in commit statistics screen
   - Move snippets UI to fluid layout
   - Improve UI for sidebar. Increase separation between navigation and content
   - Improve new project command options (Ben Bodenmiller)