feat: drop support of php < 8, fix deprecations for php 8.0/8.1, add .gitignore #2
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I know that this repo is probably unmaintaned.
But i came across that deprecation messages with my PR for Payum.
Payum/Payum#932
Deprecated: Return type of KlarnaConfig::offsetUnset($offset) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /Users/georg/PhpStorm/open-source/Payum/vendor/fp/klarna-invoice/klarnaconfig.php on line 162