SHA256 and more?

On this README.md (https://github.com/coturn/coturn/blob/master/README.md), I do not see but on https://code.google.com/archive/p/rfc5766-turn-server/, I see :
- HMAC-SHA256, with SHA256-hashed keys (an extension to the STUN and TURN specs)

Please note:
- RFC8489: Session Traversal Utilities for NAT (STUN): https://tools.ietf.org/html/rfc8489
- RFC8760: The Session Initiation Protocol (SIP) Digest Access Authentication Scheme: https://tools.ietf.org/html/rfc8760
- https://msdn.microsoft.com/en-us/library/dd949398(v=office.12).aspx

SHA-256
SHA-512/256