title: Laravel adding bcc in notification mail
body: <p>I'm always getting an error in my notification email.
  Any Idea how to support bcc in Laravel email notification?
  I used Laravel 5.4.</p>
  
  <p>Error: </p>
  
  <pre><code>Call to a member function bcc() on null
  </code></pre>
  
  <p>Codes: </p>
  
  <pre><code>$inquiry-&gt;notify(new SupportEmail("user@user.com",  $inquiry-&gt;email))-&gt;bcc("example@example.com", "admin@admin.com");
  </code></pre>