v1.2.5 04 Aug 2021
[New features]
* Implement RFC7797. The value of the header field `b64` changes
how the payload is treated in JWS
* Implement detached payloads for JWS
* Implement (jwk.AutoRefresh).ErrorSink() to register a channel
where you can receive errors from fetches and parses that occur during
JWK(s) retrieval.