Add Richard as a signer

pub   rsa4096/0xDE47360363F34B2C 2017-09-18 [SCA] [expires: 2022-09-17]
      Key fingerprint = BE7C 914C C922 CED9 D93D  23B7 DE47 3603 63F3 4B2C
uid                   [ unknown] Richard Pospesel <richard@blueprintforfreespeech.net>
uid                   [ unknown] Richard Pospesel <richard@torproject.org>
uid                   [ unknown] Richard Pospesel <pospeselr@riseup.net>
sub   rsa4096/0xF610CC654F7EB806 2017-09-18 [E] [expires: 2022-09-17]

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