* New: WordPress 5.0 support
* New: WordPress 3.5.2 support
* New: support to latest API version (2018-11-08)
* New: admin can now choose whether they want to automatically store card reference, or ask customer which cards to save (for appropriate payment modes only)
* Tweak: prevent stripe to execute subscriptions methods, when payment method for the subscription is not stripe
* Tweak: added check over gateway existence before filtering YWSBS from list
* Tweak: improved Webhook error messages
* Tweak: check over configurable properties in update_subscription method
* Update: internal plugin framework
* Update: dutch translation
* Fix: error in js to trigger elements handling
* Fix: solved issue occurring when billing state select is not visible
* Fix: implicit casting when registering a new failed invoice
* Fix: call to undefined endpoint, causing a 404 error in API; Limited labels accordingly to new limit set for the API
* Dev: added filter yith_wcstripe_error_message_order_note to let third party code filter error messages stored in order notes
