Adds some new fields to the certificate request payload that are required for certain accounts. The Signature object can now be supplied with the signature hash algorithm and the signature algorithm.
hvclient also supports flags for these new fields:
--sigalg: signature algorithm to use (e.g. "" to use policy default or specify one of, "RSA", "RSA-PSS", or, "ECDSA")
--sighash: signature hash algorithm to use (e.g. "" to use policy default or specify one of, "SHA-256", "SHA-384", or "SHA-512")