File _servicedata of Package snowflake

<servicedata>
<service name="tar_scm">
                <param name="url">https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake</param>
              <param name="changesrevision">bd7391d678a54e70baeef46d80d24e5e8225148e</param></service></servicedata>