spinner.go
func (s *Spinner) UpdateSpeed(d time.Duration) {
	s.lock.Lock()
	defer s.lock.Unlock()
	s.Delay = d
}
func (s *Spinner) UpdateSpeed(d time.Duration) {
	s.lock.Lock()
	defer s.lock.Unlock()
	s.Delay = d
}
// UpdateSpeed will set the indicator delay to the given value