code: func (r *Response) Image(im image.Image) error {
  	imageBytes := new(bytes.Buffer)
  	err := jpeg.Encode(imageBytes, im, nil)
  	if err != nil {
  		return err
  	}
  
  	return r.AttachmentData(ImageAttachment, "meme.jpg", imageBytes)
  }
docs: // Image sends an image.