Investigate issue with Laravel Valet 4

> Update any custom drivers to match the namespace, extension, type-hints, and return type-hints of the new driver system. You may consult Valet's [SampleValetDriver](https://github.com/laravel/valet/blob/d7787c025e60abc24a5195dc7d4c5c6f2d984339/cli/stubs/SampleValetDriver.php) as an example.