v9.0.0

• #270 now easier to pass you own Clock to Jwt - before that the system clock was always used. To use your own clock, use Jwt(clock) instead of just Jwt (and the equivalent for json libraries).

This break binary compatibility (hence the major version) because the signature of the traits and object is no longer the same, however for most users there should be no change required to your source code to compile with this new version.