Geert-Jan

Currently in beta, see [Create capture](https://docs.mollie.com/reference/v2/captures-api/create-capture) for details.

Closes #374

We're still supporting python 3.8, which is EOL. We're also supporting 3.9, which is close to EOL. We'll be dropping support for python 3.8 soon.

The `method` endpoint does not return pricing information anymore, so we can remove it from the Method object.