features:

* support for draft-ietf-acme-ip-06 (thanks @orangepizza for impl, @felixfontein
  for bug fixes!)
* issuer/intermediate key/cert are accessible over HTTP (thanks @adferrand!)
* support for specifying EE cert OCSP Responder URL (thanks @adferrand!)
* support for creating and offering alternative cert. chains (thanks
  @felixfontein!)
* -strict support for rejecting legacy JWS requests

misc:

* CI release asset publication pipeline (thanks @adferrand!)

bug-fixes:

* wfe: unlocking order in updateChallenge after read (thanks @dopey!)