[zapps-wg] Powers of Tau Attestation

[Mark Giannullo via zapps-wg]

I completed the challenge using Filippo's golang implementation:
https://github.com/FiloSottile/powersoftau

The BLAKE2b hash of `./response` is:
a6a754d8 68697ff0 870c8413 c5cda8f6
fe57e6bf 3a1dd30b 5f254ede 78d23879
175b4044 61573619 4df013db 4642f717
9f5602f5 1d37b9b6 88045d96 352927e1

I have also posted this hash on Twitter:
https://twitter.com/markgiannullo/status/961683650210402304