delete http method will attach an empty object in http body

[kiyonlin]

Hi!
When I use delete method, the http body will attach an empty object. It is not the same as GuzzleHttp.

    function delete($url, $params = [])
    {
        return $this->send('DELETE', $url, [
            $this->bodyFormat => $params,
        ]);
    }

Maybe takeaway $this->bodyFormat => $params, when the $params is an empty array can fix this problem.