Add Yarikoptic to allowed release keys

> pub rsa4096/A2DE235062DA33FA 2010-06-07 Yaroslav Halchenko (Yarik) <[email protected]>
> Primary key fingerprint: C5B9 05F0 E8D9 FD96 68FF  366F A2DE 2350 62DA 33FA

As per gitpython-developers#702 (comment)

Author: Byron