YITH PayPal Braintree For WooCommerce Premium 1.35.0

* Update: Plugin framework

New: Support to WooCommerce 3.7.0 RC1
Update: Plugin framework 3.3.7
Fix: Fixed issue at checkout when only PayPal module was activated
Fix: Loading text domain
Dev: Added a javascript trigger 'yith_braintree_gateway_button_ready

* Tweak: Place order button now will be disabled when the payment selected is PayPal
* Update: Plugin framework 3.3.0