RFC6331: Moving DIGEST-MD5 to Historic (etc.)

Dear @duesee,

31 August 2006: RFC4616: The PLAIN Simple Authentication and Security Layer (SASL) Mechanism:
- https://datatracker.ietf.org/doc/html/rfc4616

20 November 2008: CRAM-MD5 to Historic:
- https://tools.ietf.org/html/draft-ietf-sasl-crammd5-to-historic-00

29 June 2017: CRAM-MD5 to Historic:
- https://tools.ietf.org/html/draft-zeilenga-luis140219-crammd5-to-historic-00

July 2011: RFC6331: Moving DIGEST-MD5 to Historic:
- https://tools.ietf.org/html/rfc6331

August 2021: RFC9051: Internet Message Access Protocol (IMAP) - Version 4rev2:
"Replaced DIGEST-MD5 SASL mechanism with SCRAM-SHA-256. DIGEST-MD5 was deprecated."
- https://tools.ietf.org/html/rfc9051

In more LOGIN (it has been replaced by PLAIN), CRAM-MD5, DIGEST-MD5, I add same about CRAM-SHA1, SCRAM-MD5, NTLM.

There are now:
- July 2010: RFC5802: Salted Challenge Response Authentication Mechanism (SCRAM): SASL and GSS-API Mechanisms: https://tools.ietf.org/html/rfc5802 (SCRAM-SHA-1 and SCRAM-SHA-1-PLUS)
- July 2010: RFC5803: Lightweight Directory Access Protocol (LDAP) Schema for Storing Salted: Challenge Response Authentication Mechanism (SCRAM) Secrets: https://tools.ietf.org/html/rfc5803
- November 2015: RFC7677: SCRAM-SHA-256 and SCRAM-SHA-256-PLUS: Simple Authentication and Security Layer (SASL) Mechanisms: https://tools.ietf.org/html/rfc7677

Soon:
- SCRAM-SHA-512(-PLUS): https://tools.ietf.org/html/draft-melnikov-scram-sha-512
- SCRAM-SHA3-512(-PLUS): https://tools.ietf.org/html/draft-melnikov-scram-sha3-512

Linked to:
- https://github.com/duesee/smtp-codec/issues/17