public function run()
 {
     // Uncomment the below to wipe the table clean before populating
     DB::table('libros')->truncate();
     $faker = Faker\Factory::create();
     for ($i = 0; $i < 10; $i++) {
         # code...
         Libro::create(['titulo' => $faker->text(40), 'isbn' => $faker->numberBetween(100, 999), 'precio' => $faker->randomFloat(2, 3, 150), 'publicado' => $faker->numberBetween(0, 1), 'descripcion' => $faker->text(400), 'autor_id' => $faker->numberBetween(1, 3), 'categoria_id' => $faker->numberBetween(1, 3)]);
     }
     // Uncomment the below to run the seeder
     // DB::table('libros')->insert($libros);
 }