Active field should not be required for Kratos registration

[AntiSC2]

Kratos version: v0.2.1-alpha.1
Oathkeeper version: v0.38.1-beta.1
SDK version: Python 0.2.1a1

When calling:
api_response = api_instance.get_self_service_browser_registration_request(request)
I get the following exception:
Invalid value for 'active', must not be 'None'
This is the same problem as #10 and #11 and I think the solution here is the same.

The following line is the one that causes the problem: https://github.com/ory/kratos/blob/master/selfservice/flow/registration/request.go#L45

omitempty-flag is set but required true is also set so an exception is thrown in the Python SDK when it is omitted. The solution is probably to remove required: true. Strangely, this is only set for the registration flow, not any other flow and I don't know if you can set this active property. I don't see anything about it in the documentation. Also the active property documentation in the SDK seems a bit broken, it just says:

and so on.