Give - PayPal Pro Gateway 1.3.0

* New: There is now an option to prefix PayPal invoice numbers to differentiate which payments were created by Give compared to other sources.
* New: Implemented the ability to process refunds within the donation payment details screen for all of PayPal Pro's APIs.
* New: Payments processed through Give + PayPal Pro can now have a customizable invoice prefix so that you can more easily identify which payments were received through the plugin.
* Fix: Updated the PayPal API library to resolve issue with the REST API not working.

* Fix: Ensure compatibility with PayPal Pro (Payflow) Fraud Protection controls. Donations flagged by PayPal's fraud filter will be marked pending and a note will be added to the payment with a link to the payment under review.

* New: Compatibility with Currency Switcher 1.1 and Give Core 2.1+ - Please update to the latest of all add-ons for maximum compatibility.
* Tweak: Minimum WP version has been bumped to 4.5+
* Fix: Added checks to ensure that Give is active prior to using gateway.