code: func (o *OAuthSession) NeedsCaptcha() (bool, error) {
  	var b bool
  	err := o.getBody("https://oauth.reddit.com/api/needs_captcha", &b)
  	if err != nil {
  		return false, err
  	}
  	return b, nil
  }
docs: // NeedsCaptcha check whether CAPTCHAs are needed for the Submit function.