code: func (s Session) CaptchaImage(iden string) (image.Image, error) {
  	req := &request{
  		url:       fmt.Sprintf("https://www.reddit.com/captcha/%s", iden),
  		useragent: s.useragent,
  	}
  
  	p, err := req.getResponse()
  
  	if err != nil {
  		return nil, err
  	}
  
  	m, err := png.Decode(p)
  
  	if err != nil {
  		return nil, err
  	}
  
  	return m, nil
  }
docs: // CaptchaImage gets the png corresponding to the captcha iden and decodes it