Woocommerce Aweber Newsletter Subscription 4.0.4

* Feature - Subscribe the customers to the registration list when creating an account during checkout.
* Tweak - Display the subscription field during checkout only when needed.
* Tweak - Added the IPv6 address '::1' to the list of local IP addresses.
* Tweak - Tested compatibility with WC 6.8

* Tweak - Tested compatibility up to WC 6.7.
* Tweak - Tested compatibility up to WP 6.0

* Fix - Fixed migration to update the setting product tags from the checkout rules.