HTTP Documentation of groups.create doesn't reflect the required "members" attribute

[skamensky]

Running
group = client.groups.create('groupname')
raises an error. After debugging, the content of the request is:

'{"formErrors":[],"inputErrors":{"members":[{"code":"MEMBERS_FIELD_IS_REQUIRED","msg":"Members field is required."}]}}'

Even though the HTTP documentation shows that members is optional.
This makes using the groups.create impossible without modifying the source code.

The code below is a workaround.

client._session.post(
    '{prfx}pubapi/v2/groups'.format(prfx=client._url_prefix),
    json = {'displayName' : 'test3','members' : [{"value": 1}]}
    )