title: Add custom order status and send email on status change in Woocommerce
body: <p>I want to add custom order status in my woocommerce site.And whenever status changes to that custom status I want to send mail.<br>
  I have tried <strong><em><a href="https://stackoverflow.com/questions/43716196/send-an-email-notification-when-custom-order-status-changes-in-woocommerce">Send an email notification when custom order status changes in WooCommerce</a></em></strong><br>as well as <strong><em><a href="https://github.com/sarun007/custom-email-plugin/tree/master" rel="nofollow noreferrer">https://github.com/sarun007/custom-email-plugin/tree/master</a></em></strong><br>But didn't worked<br>I am using woocommerce <b>3.2.6</b> version</p>