get exception when Guzzle 6.3 is using in project

[realyibo]

Passing in the "body" request option as an array to send a POST request has been deprecated. Please use the "form_params" request option to send a application/x-www-form-urlencoded request, or the "multipart" request option to send a multipart/form-data request.

[realyibo]

This is error shows up when Guzzle is over 6.3.
Just replace "body" to "form_params" in line 40 of GuzzleAsyncRunner can solve this problem.