Persistance is a common misspelling for Persistence #664
Description
This project uses the word Persistance in the codebase which is a common misspelling of Persistence
See https://github.com/picqer/exact-php-client/blob/6463d3da7f8fdd93875d0ef3ab87400cbcc48b88/src/Picqer/Financials/Exact/Persistance/Downloadable.php#L3C35-L3C46 where it is used in the namespace and the usages when importing namespaces in the different models. (use Persistance\Storable;)