Update 4.7-final.md

doc/4.7-final.md

@@ -27,6 +27,7 @@ ssh-add ~/.ssh/id_rsa
  * Compare the git revisions
      * https://download.civicrm.org/latest/civicrm-RC-drupal.tar.gz/inspect
      * https://github.com/civicrm/civicrm-core/commits/4.7.X-rc
+     * https://github.com/civicrm/civicrm-backdrop/commits/1.x-4.7.X-rc
      * https://github.com/civicrm/civicrm-drupal/commits/6.x-4.7.X-rc
      * https://github.com/civicrm/civicrm-drupal/commits/7.x-4.7.X-rc
      * https://github.com/civicrm/civicrm-joomla/commits/4.7.X-rc