WooCommerce Zapier Integration 2.13.0

* Full details: WooCommerce Zapier Version 1.7.4 Released
* Fix: Avoid a fatal error that was occurring when orders or subscriptions containing a deleted product were being sent to Zapier. In those cases cases, the line_items.categories, line_items.tags and line_items.type data fields will be empty. #121

* Full details: WooCommerce Zapier Version 1.7.3 Released
* Fix: New Order trigger not consistently triggering for orders that use the PayPal Standard payment gateway with PayPal IPN. #119
* Change: Improved logging for queue processing. #119

* Full details: WooCommerce Zapier Version 1.7.2 Released
* New: Coupons field for Orders, which is a comma-separated list of coupon codes that were used for the order.
* Send unique sample data so the "Pick a Sample to Set Up Your Zap" screen in the Zap editor shows the most recent sample data.
* Send JSON Content-Type header when sending data to Zapier.
* WooCommerce 3.4 compatibility.
* GDPR privacy support (requires WordPress 4.9.6+ and WooCommerce 3.4+).