Transfer ownership

[not-so-smart]

Group#transferOwnershipTo(newOwner: string): Promise<Group>

Transfers ownership of a group to another user.

Usage:

const group = client.groups.cache.get('12345')
group.transferOwnershipTo('67890');

Apparently, the API only does change_owner requests in bulk for some reason. This is dumb, so the library will not reflect this bulk transfer operation. Instead, transfers will be done directly on Group instances and each call will only send one change_owner request, despite the API allowing for multiple to be sent at once.

[striker4150]

I think this is already implemented?