ecdsa: der: use impl `EncodeValue`/`DecodeValue` on `SignatureRef`#965

tarcieri merged 3 commits intoRustCrypto:masterRustCrypto/signatures:masterfrom

dishmaker:dishmaker/ecdsa_der_decode_encode_valuedishmaker/signatures:dishmaker/ecdsa_der_decode_encode_valueCopy head branch name to clipboard