v3.1.0

• Implement new and improve credit card workflow for one-click checkout
• Update paymentSDK to version 4.0.2
• Remove php-enum dependency

Overview	Magento version	PHP 5.6	PHP 7.0	PHP 7.1	PHP 7.2
Tested version(s)	Magento Community Edition 2.3.3	❌	❌	✅	✅
Compatibility	Magento Community Edition 2.2.0 - 2.3.3	❌	✅	✅	✅