[SCION] SCION mailing list update

[Adrian Perrig]

Dear SCION mailing list subscribers

Thank you for subscribing to this mailing list! As you can see from
the dearth of traffic, we are not really making use of this list any
more. For different types of information about SCION, we suggest the
following:

- General information: SCION Association web site: https://www.scion.org/
  You can sign up for their quarterly newsletter on the bottom of this page.
- SCION developer Slack channel. The link to join the channel is at
  the bottom of the scionproto github repository:
https://github.com/scionproto/scion
- SCION resources are listed on the SCION awesome page:
https://github.com/scionproto/awesome-scion
- Information about the SCION Education, Research and Academic Network
(SCIERA): https://sciera.readthedocs.io
- SCIONLab overlay-based research network: https://scionlab.org/
- SCION documentation: https://scion.docs.anapaya.net/en/latest/

Please let us know if you have any comments, questions, or suggestions.

With all the best wishes
  Adrian