Issue on MakeRequest() method with calling Type("multipart") before

[nisiyu]

I'm now using gorequest lib to do some httptest in my code, and I found a problem that when I want to use makerequest with a Type method called before, It will always make a request with application/json content-type header, like the code below.

  goreqObj := gorequest.New()
  goreqObj.
   Post("/v1/api/company/employees").
   Type("multipart").
   Set("Authorization", "Bearer "+authToken).
   Send(body)
  req, _ := goreqObj.MakeRequest()
  w := httptest.NewRecorder()
  r.ServeHTTP(w, req)

Then I check the source code in gorequest lib, I found that Type() method assigns multipart in a field of "ForceType" in the SuperAgent. But only "TargetType" is regarded in the MakeRequest() method. Only when use EndByte() method, the ForceType is assigned to the TargetType

For this case, I insert the code before MakeRequest() to solve this problem.

  goreqObj.TargetType = goreqObj.ForceType

I'm wondering if it is a bug.