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