code: func (api *API) DeleteRailgun(railgunID string) error {
  	uri := api.userBaseURL("") + "/railguns/" + railgunID
  	if _, err := api.makeRequest("DELETE", uri, nil); err != nil {
  		return errors.Wrap(err, errMakeRequestError)
  	}
  	return nil
  }
docs: // DeleteRailgun disables and deletes a Railgun.
  //
  // API reference: https://api.cloudflare.com/#railgun-delete-railgun