:sparkles: Improvements

• Compatible with Laravel 5.8 (34d8e48b2a3dd779f37e53fcb76f37e69e8cdd25)
• Compatible with Carbon 2 (8dfa7952bf752ea1867fcb038a92e01e4b0d8668)

:bug: Bug fixes

• Allow nbf claim to be in the future (b860a4ca219d6d76374445cffd9836b1bd1db9a6)

:art: Other

• Increase generated secret key length in jwt:secret command to 64 characters (f72b8eb0deff2c002d40a8b0411a546c28ebec98)