Adding reason and reversedAt attributes to Chargeback resource

[dmdijkslag]

Mollie has 2 additional attributes for its chargebacks endpoint, see https://docs.mollie.com/reference/v2/chargebacks-api/get-payment-chargeback for more info.

This will update the Chargeback resourse with the additional attributs.

For possible reason codes see https://help.mollie.com/hc/nl/articles/115000309865

[sandervanhooft]

Thanks @dmdijkslag ! You're right. Only one remark:

[dmdijkslag]

@sandervanhooft thanx for the update, you are right. I updated the resource and test.

[sandervanhooft]

Thanks @dmdijkslag !