Update send_message() README documentation to reflect ability to start a new chat

[elliot-100]

@olizimmermann this relates to your #62 - do you have any comments?

[Olen]

Just a question - is it possible to only specify user, or is group_id a requirement in the API?

[elliot-100]

Just a question - is it possible to only specify user, or is group_id a requirement in the API?

Implementation requires both:

elif group_uid is None or user is None:
    return {
        "error": "wrong usage, group_id and user_id needed or continue chat with chat_id"
        }

I don't think it should be necessary to supply group_id, as a user inherently belongs to one group.
I would prefer a definitive user_uid to be required here rather than a fuzzy user string that's internally looked up with get_person(user).

Also not sure why an actual Exception isn't raised.

But this amend is to correctly document the status quo.

[olizimmermann]

I will push an update next week. Currently afk

[Olen]

Yeah. We should merge this as it is only documentation. And the we can update the actual function later.

[olizimmermann]

Hey guys,
Thanks for updating the docstring/readme.