title: Add an attachment to admin email-notification once order is placed in Woocommerce
body: <p>I am trying to send a PDF file to shop admin once the new order is placed. The issue with <code>woocommerce_email_attachments</code> hook is that email is sent to both customer and admin.</p>
  
  <pre class="lang-php prettyprint-override"><code>add_filter( 'woocommerce_email_attachments', 'attach_order_notice', 10, 3 );
  
  function attach_order_notice ( $attachments, $id, $object ) {
      $pdf_path = get_template_directory() . '/notice.pdf';
      $attachments[] = $pdf_path;
      return $attachments;
  }
  </code></pre>
  
  <p>At the moment both customer and admin receive new order emails (including attachments) and I expect both customer and admin receive new order emails but only send an attachment to admin. </p>
  
  <p>Is this even possible?</p>