documents create api: recipient verification not supported

[leejayhsu]

It would be nice for this sdk to support setting verification settings on recipients when creating a document. The below json is valid for the public/v1/documents api

{
    "name": "test document",
    "template_uuid": "871638162881",
    "recipients": [
        {
            "email": "someone@asdf.asdf",
            "first_name": "John",
            "last_name": "Doe",
            "role": "Client",
            "signing_order": 1,
            "verification_settings": {
                "verification_place": "before_open",
                "passcode_verification": {
                    "passcode": "SimpleCode1"
                }
            }
        }
    ]
}

Unfortunately, verificationSettings is not supported here