title: woocommerce - update order status without sending customer email
body: <p>I currently use </p>
  
  <pre><code>$order = new WC_Order($order_id);
  $order-&gt;update_status('completed', 'Order has been delivered.'); 
  </code></pre>
  
  <p>to update order status but this sends out an email to the customer.  I have hundreds of old customers and i don't want emails to be sent for to them when i update the status.  Is there an alternative way to change the status of an order without sending emails?</p>