enable `ES256K` for ECDSA signing scheme#113

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pohutukawa wants to merge 5 commits intompdavis:masterfrom

pohutukawa:master

Commits on Nov 27, 2018

removed duplicate dependency statement ecdsa
Guy K. Kloss
committed
added ES256K algorithm for secp256k1 signatures (as used in Ethereum, Bitcoin and uPort)
Guy K. Kloss
committed
added missing ES256K constants for JWK handling
Guy K. Kloss
committed
fixed typo in constant from cryptography backend
Guy K. Kloss
committed

Commits on May 6, 2019

Merge branch 'master' into master
pohutukawa
authored