opts.go
func LoggingService(service *logging.Service) Option {
	return func(sh *StackdriverHook) error {
		sh.service = service.Entries
		return nil
	}
}
func LoggingService(service *logging.Service) Option {
	return func(sh *StackdriverHook) error {
		sh.service = service.Entries
		return nil
	}
}
// LoggingService is an option that sets the Google API logging service to use.