support new format to allow drop downs in swagger-ui

[mikee805]

recently upgraded our version of swagger4spring-web and our dropdowns stopped working.

according to swagger-api/swagger-ui#685
they have changed format.
{
"name": "status",
"in": "query",
"default": "available",
"enum": [
"alive",
"dead",
"available"
],
"description": "Status values that need to be considered for filter",
"required": true,
"type": "string"
}

currently this is being returned:
{
"name": "status",
"description": "Status values that need to be considered for filter",
"required": true,
"allowMultiple": false,
"dataType": "status",
"allowableValues":
{
"values":
[
"alive",
"dead",
"available"
],
"valueType": "LIST"
},
"paramType": "query",
"paramAccess": ""
}

great library makes our lives easier.

Thanks,
Mike