Change user database seeder to User create

Factory helper uses Faker, which only dev dependency
If we use command "composer install --no-dev"
the database user seeder will throw error because
Faker not found.

database/seeds/UsersTableSeeder.php

@@ -12,9 +12,11 @@ class UsersTableSeeder extends Seeder
      */
     public function run()
     {
-        factory(User::class)->create([
+        User::create([
             'name'           => 'Administrator',
             'username'       => 'admin',
+            'password'       => 'secret',
+            'remember_token' => str_random(10),
         ]);
     }
 }