More entries to CHANGELOG

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

CHANGELOG

@@ -11,6 +11,12 @@ v 6.3.0
   - You can create file in repo using UI
   - API: dropped default_branch attribute from project during creation
   - Project default_branch is not stored in db any more. It takes from repo now.
+  - Admin broadcast messages
+  - UI improvements
+  - Dont show last push widget if user removed this branch
+  - Fix 500 error for repos with newline in file name
+  - Extended html titles
+  - API: create/update repo files
 
 v 6.2.0
   - Public project pages are now visible to everyone (files, issues, wik, etc.)