File _servicedata of Package appstream-glib

<servicedata>
  <service name="tar_scm">
    <param name="url">https://github.com/hughsie/appstream-glib.git</param>
    <param name="changesrevision">830cdbd0581110bdb74188e7a66c272cd059f5bb</param>
  </service>
</servicedata>