We've now got test coverage against PHP 7.3+ and Laravel 6.x, all the way up to PHP 8.0 and Laravel 8.x. There's no compatibility issues from supporting the wide range of versions so we've opened it up to support them all. This gives people using Laravel 6.0 LTS the ability to use the latest implementation of pushok.
As PHP 7.3 hits EOL and Laravel 6's LTS come to an end this support will be phased out, but for the time being they have access to the latest version.