HttpSuccesss doesn't create Body -> error nil pointer dereference [Bug]

assert.HTTPSuccess() is failing in my case when my code does r *http.Request ioutil.ReadAll(r.Body).

I believe that https://github.com/stretchr/testify/blob/f35b8ab0b5a2cef36673838d662e249dd9c94686/assert/http_assertions.go#L13 should create body (even empty).