quque range (function minQuantity)

[shitingbao]

When the max num value, it will overflow

example:

	var m uint32 = 4294967295
	log.Println(minRoundNumBy2(m))

then, you will get 0

[shitingbao]

example,I add some code

	if ^v == 0 {
		v-- // the v type is uint32
	} else {
		v++
	}