YITH WooCommerce Stripe Premium 3.29.0

* New: added WordPress 4.9.8 compatibility
* New: added WooCommerce 3.5-RC compatibility
* New: updated Stripe API version to 2018-09-24
* New: updated plugin framework
* New: added pt_PT translation (thanks to Ricardo A.)
* Tweak: plugin now registers card even for subscription only orders;
* Tweak: set default card when processing subscriptions
* Tweak: removed create_function for php 7.2 compatibility
* Tweak: removed usage of deprecated WC function from gateway class
* Tweak: improved error handling for invoices: skip useless checks, and add notes to renew order, instead of parent one
* Fix: order total when paying from order-pay endpoint
* Fix: notices when registering a card
* Fix: check over subscription expiration date
* Fix: get_plan now does not create new plans any longer when just used to check plan existance (this mainly happens when checking if order has active subscription)
* Fix: SSL error notification on admin pages
* Fix: warning when failed attempts is not an array
* Dev: added yith_wcstripe_before_create_token trigger
* Dev: added yith_wcstripe_add_payment_method_result filter
* Dev: added yith_wcstripe_gateway_us_icons filter
* Dev: added yith_wcstripe_gateway_default_icons filter
* Dev: added yith_wcstripe_gateway_icon filter
* Dev: added yith_wcstripe_use_plugin_error_codes filter to show original API error messages
* Dev: added yith_wcstripe_error_message filter to let third party code filter error messages

* New: WooCommerce 3.4.0 support
* New: WordPress 4.9.6 support
* New: updated plugin fw
* New: GDPR compliance
* New: Stripe library 6.7.1 (Requires API update on Stripe Dashboard)
* New: trial period is now added only when Subscription Product has trial set
* New: added billing and shipping information on Stripe Checkout payment mode
* New: added Hosted mode, similar to free version
* Tweak: added description to renew charges after successful charge webhook
* Tweak: improved customer handling when registering cards
* Tweak: moved notify_failed_renewal to avoid issues when adding a new card from My Account endpoint
* Fix: plan creation, for newer version of API
* Fix: now subscription is cancelled after end date
* Fix: improved js to avoid implict conversions
* Dev: added yith_wcstripe_plan_trial_period filter
* Dev: added filter yith_wcstripe_gateway_enabled to programmatically enable/disable Stripe Gateway
* Dev: added filter yith_wcstripe_gateway_id to let developers filter gateway ID (Use this filter at your own risk; after filtering gateway ID you will need to configure gateway again)

New: WooCommerce 3.3.1 support
New: WordPress 4.9.4 support
New: updated Stripe library to 6.0 revision
New: updated plugin-fw library