File _servicedata of Package update-checker

<servicedata>
  <service name="tar_scm">
    <param name="url">git://github.com/thkukuk/update-checker.git</param>
    <param name="changesrevision">70430e23086735e8b0cf0623db882d2954cb0a0a</param>
 </service>
</servicedata>