User.php

<?php

namespace App;

use Illuminate\Notifications\Notifiable;
use Illuminate\Foundation\Auth\User as Authenticatable;

/**
 * App\User
 *
 * @property-read \Illuminate\Notifications\DatabaseNotificationCollection|\Illuminate\Notifications\DatabaseNotification[] $notifications
 * @mixin \Eloquent
 */
class User extends Authenticatable
{
    use Notifiable;

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'username', 'email', 'password',
    ];

    /**
     * The attributes that should be hidden for arrays.
     *
     * @var array
     */
    protected $hidden = [
        'password', 'remember_token',
    ];
    
    public function newNotification () {
      $this->notify(new Notification);
    }
}