New entries to CHANGELOG

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

CHANGELOG

@@ -20,6 +20,12 @@ v 7.0.0
   - Improve performance of application for projects and groups with a lot of members
   - Formally support Ruby 2.1
   - Include Nginx gitlab-ssl config
+  - Add manual language detection foir highlight.js
+  - Added example.com/:username routing
+  - Show notice if your profile is public
+  - UI improvements for mobile devices
+  - Improve diff rendering performance
+  - Drag-n-drop for issues and merge requests between states at milestone page 
 
 v 6.9.2
   - Revert the commit that broke the LDAP user filter