** Various cleanups and improvements to the API.
** Improvements to the handling of YubiKeys and connections.
** Command aliases for ykman 3.x (introduced in ykman 4.0) have now been dropped.
** Installers for ykman are now provided for Windows (amd64) and MacOS (universal2).
** Logging has been improved, and a new TRAFFIC level has been introduced.
** The codebase has been improved for scripting usage, either directly as a Python
module, or via the new "ykman script" command.
See doc/Scripting.adoc, doc/Library_Usage.adoc, and examples/ for more details.
** PIV: Add support for dotted-string OIDs when parsing RFC4514 strings.
** PIV: Drop support for signing certificates and CSRs with SHA-1.
** FIDO: Credential management commands have been improved to deal with ambiguity
in certain cases.
** OATH: Access Keys ("remembered" passwords) are now stored in the system keyring.
** OpenPGP: Commands have been added to manage PINs.