Replace deprecated array and string helpers

Laravel recommends using the `Str` and `Arr` class methods directly instead of the respective helper functions. These helper functions are deprecated in Laravel 5.8 and removed in Laravel 6.

database/factories/ModelFactory.php

@@ -2,6 +2,8 @@
 
 namespace Database\Factories;
 
+use Illuminate\Support\Str;
+
 /*
 |--------------------------------------------------------------------------
 | Model Factories
@@ -21,6 +23,6 @@ $factory->define(App\User::class, function (Faker\Generator $faker) {
         'name' => $faker->name,
         'email' => $faker->unique()->safeEmail,
         'password' => $password ?: $password = bcrypt('secret'),
-        'remember_token' => str_random(10),
+        'remember_token' => Str::random(10),
     ];
 });