[tor-relays] New contact info for guard node Austrina

Dear relay operators / users:

I operate the guard node Austrina (fp: CA54 C9F2 AA56 FE26 D7A1 6F26 93F6 5385 E85E 2D75) and have recently updated my public key.

Any sensitive communications should now use public key 0xEC2C9934 (fp: F259 8DED 56ED E408 FD41 484B FB39 BCF7 EC2C 9934) available from pgp.mit.edu. Please update your keystores, and verify that the new key is cross-signed with the old one (0x0DBB515F).

Verification can also be performed via DNS — `dig +short sam._pka.samwhited.com TXT` should give the same fingerprint as above and provide an alternate download location.

Contact info on the node should update shortly.

Thanks, Sam