Assigned created_at, updated_at on create table in Laravel

2018_08_08_000000_create_users_table.php

<?php

use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreateUsersTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('users', function (Blueprint $table) {
            {
                $table->increments('id');
                $table->string('username', 20);
                $table->string('name', 20);
                $table->string('email', 200);
                $table->string('password', 100);
                $table->string('login_info', 200);

                $table->timestamp('created_at')->useCurrent();
                $table->timestamp('updated_at')->default(DB::raw('CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP'));
            }
        });


    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('users');
    }
}