k256: remove ecdsa::recoverable
module; add replacement docs
#675
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Support for recovering
VerifyingKey
s from signatures has been upstreamed into theecdsa
crate in RustCrypto/signatures#576.This commit removes the
ecdsa::recoverable
module and the custom impls ofSigningKey
/VerifyingKey
needed to support it.In its places are docs about how to use the generic APIs to accomplish equivalent functionality.