I'm getting a fatal error:

Fatal error: Uncaught Error: Class "WordPressValetDriver" not found in /Users/myname/.config/valet/Drivers/WordPressProxyValetDriver.php:22 Stack trace: #0 /Users/myname/.composer/vendor/laravel/valet/cli/Valet/Drivers/ValetDriver.php(97): require_once() #1 /Users/myname/.composer/vendor/laravel/valet/cli/Valet/Drivers/ValetDriver.php(122): Valet\Drivers\ValetDriver::driversIn('/Users/myname...') #2 /Users/myname/.composer/vendor/laravel/valet/cli/Valet/Drivers/ValetDriver.php(45): Valet\Drivers\ValetDriver::customDrivers() #3 /Users/myname/.composer/vendor/laravel/valet/server.php(54): Valet\Drivers\ValetDriver::assign('/Users/myname...', 'clientname', '/') #4 {main} thrown in /Users/myname/.config/valet/Drivers/WordPressProxyValetDriver.php on line 22

When trying to restart valet, I'll get:

Please make sure all custom drivers have been upgraded for Valet 4. See the upgrade guide for more info: https://github.com/laravel/valet/blob/master/UPGRADE.md