Replace ecdsa with cryptography for key generation and signing #221#222

bobbrodie merged 1 commit intobitpay:8.0.xbitpay/python-bitpay-client:8.0.xfrom

swlodarski-sumoheavy:8.0.x-221swlodarski-sumoheavy/python-bitpay-client:8.0.x-221Copy head branch name to clipboard