Support QUERY method

HTTPWG has proposed a new QUERY method <https://httpwg.org/http-extensions/draft-ietf-httpbis-safe-method-w-body.html> which is under IESG review (last step before it becomes an RFC). When I use QUERY to make an HTTP request with rest-client, it does not work (I work around it by writing a fetch request in JS, but it is not as nice and convenient). 

Please add support for the QUERY method! 