v1.2.13 07 Dec 2021
[New Features]
* `jwt` package now has a `Builder` that may make it easier to programmatically
create a JWT for some users.
* `jwt` errors now can be distinguished between validation errors and others.
Use `jwt.IsValidationError()` to check if it's a validation error, and then
use `errors.Is()` to check if it's one of the known (oft-used) errors