progressbar.go
func (b *ProgressBar) Value() int {
	b.mtx.RLock()
	defer b.mtx.RUnlock()
	return b.value
}
func (b *ProgressBar) Value() int {
	b.mtx.RLock()
	defer b.mtx.RUnlock()
	return b.value
}
// Value returns the current ProgressBar value