title: Additional recipients on woocommerce invoice
body: <p>Is there way to add additional recipients to woocommerce invoice mail.
  I have tried to use 'woocommerce_email_headers' hook, but it's not working:</p>
  
  <pre><code>add_filter( 'woocommerce_email_headers', 'mycustom_headers_filter_function', 10, 2);
  
  function mycustom_headers_filter_function($headers, $object) {
      $headers = array();
      $headers[] = 'Bcc: My Name &lt;me@gmail.com&gt;';
      $headers[] = 'Content-Type: text/html';
      return $headers;
  }
  </code></pre>
  
  <p>Any advice?</p>