Progress bar not drawn when stdout is redirected on Windows

[AndreKR]

How to reproduce:

bar := pb.New(1000)
bar.Output = os.Stderr
bar.Start()

Run with:

myprogram > output

Expected:
Progress bar is drawn because output goes to Stderr and Stderr is a terminal.

Actual:
No progress bar is drawn, only counters and percentage is shown.

[sanjidchogle]

I can reproduce this too on Windows 10 64 bit.
go get gopkg.in/cheggaaa/pb.v1

[gnojus]

I think this is fixed in ca37cd7