type hint faker generator

allow IDE to help with autocompletion

database/factories/ModelFactory.php

@@ -11,7 +11,7 @@
 |
 */
 
-$factory->define(App\User::class, function ($faker) {
+$factory->define(App\User::class, function (\Faker\Generator $faker) {
     return [
         'name' => $faker->name,
         'email' => $faker->email,