Update CHANGELOG.

CHANGELOG-EE.md

@@ -105,6 +105,7 @@ Please view this file on the master branch, on stable branches it's out of date.
   - Allow syncing a group against all providers at once
   - Change LdapGroupSyncWorker to use new LDAP group sync classes
   - Allow LDAP `sync_ssh_keys` setting to be set to `true`
+  - Restrict protected branch access to specific groups !645
   - Removed unused GitLab GEO database index
   - Restrict protected branch access to specific users !581
   - Enable monitoring for ES classes