v1.6.0

Added

• Support for updated downgrade protection in SCRAM XEP-0474 – #17

Fixed

• Additional attributes in SCRAM should be ignored if unknown to the implementation as per RFC 5802 – #18
• Additional attributes in SCRAM can occur now in any order as per RFC 5802 – #18
• Additional attribute "m" in SCRAM should fail authentication as per RFC 5802 – #18