Move backup permission changes to version 7.10

CHANGELOG

 Please view this file on the master branch, on stable branches it's out of date.
 
 v 7.10.0 (unreleased)
+  - Restrict permissions on backup files
 
 v 7.9.0 (unreleased)
   - Add HipChat integration documentation (Stan Hu)
@@ -34,7 +35,6 @@ v 7.9.0 (unreleased)
   - Add a service to send updates to an Irker gateway (Romain Coltel)
   - Add brakeman (security scanner for Ruby on Rails)
   - Slack username and channel options
-  - Restrict permissions on backup files
   - Add grouped milestones from all projects to dashboard.
   - Web hook sends pusher email as well as commiter
   - Add Bitbucket omniauth provider.