1.0.4

What's Changed

• [Bug]: Fix readme by @kingjia90 in #6
• [Bug]: Fix phpdoc handleResponse by @kingjia90 in #13
• [Task]: Setup PhpStan by @kingjia90 in #11

https://github.com/pimcore/payment-provider-paypal-smart-payment-button/issues?q=is%3Aclosed+milestone%3A1.0.4
Full Changelog: v1.0.3...v1.0.4