Path Args Components Unable To Be Rendered

[Noupin]

With OpenAPI 3 and up the path arguments have to be inside a schema to be recognized. In paths.py argument_to_param the 'type', 'format', and 'default' are all just put in the param dictionary to fix this the spec version could be passed to argument_to_param and if it is >= 3 then put the previously mentioned values inside a schema dictionary inside of params. I'm sure there is a better fix but something like this would suffice:

def argument_to_param(argument, rule, spec_version, override=None):
    param = {
        'in': 'path',
        'name': argument,
        'required': True,
    }
    type_, format_ = CONVERTER_MAPPING.get(type(rule._converters[argument]), DEFAULT_TYPE)
    if spec_version < 3:
        param['type'] = type_
        if format_ is not None:
            param['format'] = format_
        if rule.defaults and argument in rule.defaults:
            param['default'] = rule.defaults[argument]
    else:
        param['schema'] = {}
        param['schema']['type'] = type_
        if format_ is not None:
            param['schema']['format'] = format_
        if rule.defaults and argument in rule.defaults:
            param['schema']['default'] = rule.defaults[argument]
    param.update(override or {})
    return param