@Override
    public Converter<Object, RequestBody> requestBodyConverter(Type type, //
                                                               Annotation[] parameterAnnotations, //
                                                               Annotation[] methodAnnotations, //
                                                               Retrofit retrofit) {
        return new RequestBodyConverter<Object>();
    }
@author ligboy, wenshao
@author Victor.Zxy
src/main/java/com/alibaba/fastjson/support/retrofit/Retrofit2ConverterFactory.java