OpenAPI specification still mentions ShareInviteBankInquiry

Hi, bunq🌈!

I just noticed that the OpenAPI specification (`swagger.json`) doesn't include this changelog item: https://beta.doc.bunq.com/basics/changelog#july-9-2019

As a result, the following removed models are still part of the specification:
- `ShareInviteBankInquiry(Read|Update|Listing|Create|Batch)`
- `ShareInviteBankResponse(Read|Update|Listing|Create|Batch)`
and likely a few others