• Drop support for Python < 3.6.
• Drop reliance on libusb and libykpersonalize.
• Support the "fido" and "otp" subcommands over NFC (using the --reader flag)
• New "ykman --diagnose" command to aid in troubleshooting.
• New "ykman apdu" command for sending raw APDUs over the smart card interface.
• Restructuring of subcommands, with aliases for old versions (to be removed in a future release).
• Major changes to the underlying "library" code:
  • New "yubikit" package added for custom development and advanced scripting.
  • Type hints added for a large part of the "public" API.
• OpenPGP: Add support for KDF enabled YubiKeys.
• Static password: Add support for FR, IT, UK and BEPO keyboard layouts.