Add Disk facade.

config/app.php

@@ -170,6 +170,7 @@ return [
 		'Cookie'    => 'Illuminate\Support\Facades\Cookie',
 		'Crypt'     => 'Illuminate\Support\Facades\Crypt',
 		'DB'        => 'Illuminate\Support\Facades\DB',
+		'Disk'      => 'Illuminate\Support\Facades\Disk',
 		'Eloquent'  => 'Illuminate\Database\Eloquent\Model',
 		'Event'     => 'Illuminate\Support\Facades\Event',
 		'File'      => 'Illuminate\Support\Facades\File',