title: Laravel: HTML in notification
body: <p>I'm using the default <a href="https://laravel.com/docs/5.3/notifications" rel="noreferrer">notification system</a> (Laravel 5.3) to send an email. I want to add HTML tags in message. This does not work (it displays the strong tags in plain text):</p>
  
  <pre><code>public function toMail($notifiable)
  {
      return (new MailMessage)
                  -&gt;subject('Info')
                  -&gt;line("Hello &lt;strong&gt;World&lt;/strong&gt;")
                  -&gt;action('Voir le reporting', config('app.url'));
  }
  </code></pre>
  
  <p>I know it's normal because text is displayed in <code>{{ $text }}</code> in the mail notification template. I tried to use the same system as in <code>csrf_field()</code> helper:</p>
  
  <pre><code>-&gt;line( new \Illuminate\Support\HtmlString('Hello &lt;strong&gt;World&lt;/strong&gt;') )
  </code></pre>
  
  <p>But it does not work: it displays strong as plain text. </p>
  
  <p><strong>Can I send HTML tags without changing the view?</strong> (I don't want to change the view: protecting text is OK for all other cases). Hope it's clear enough, sorry if not.</p>