title: Laravel MustVerifyEmail doesn't exist?
body: <p>I am developing a web application using laravel.</p>
  
  <p>I want to implement email verification via
   <a href="https://laravel.com/docs/5.7/verification" rel="nofollow noreferrer">https://laravel.com/docs/5.7/verification</a></p>
  
  <p>I modified my User model to use MustVerifyEmail interface:</p>
  
  <pre><code>namespace App;
  
  use Illuminate\Notifications\Notifiable;
  use Illuminate\Contracts\Auth\MustVerifyEmail;
  use Illuminate\Foundation\Auth\User as Authenticatable;
  
  use App\SecurityQustion;
  
  class User extends Authenticatable implements MustVerifyEmail
  {
      use Notifiable;
  </code></pre>
  
  <p>And I am getting the following error:</p>
  
  <blockquote>
    <p>Interface 'Illuminate\Contracts\Auth\MustVerifyEmail' not found</p>
  </blockquote>
  
  <p>I verified in my vendor/laravel.../Auth/ folder and the file itself doesn't appear to be there.</p>
  
  <hr>
  
  <p>To be noted:</p>
  
  <ul>
  <li>The Auth functionality works good, it was installed with <code>php artisan make:auth</code>, and the migrations generated were runned, so this is not the issue.</li>
  </ul>