the progress bar length is always changing when the idea console output.

4798 / 36850 [=====>---------------------------------------] 13.02 % 1506/s 21s

17718 / 36850 [========================================>--------------------------------------------] 48.08 % 2040/s 9s

this length is always changing.

```scala
val a=Array(1,2,3,4,5,6,7,8,9,10)
var pb = new ProgressBar(a.length)
//pb.showSpeed = true//默认true
for (_ <- 1 to a.length) {
pb.add(1)
Thread.sleep(1500)
}
println("done")
```

```xml

jitpack.io
https://jitpack.io


com.github.matfax
pb-scala
v0.3.2

```
```