Windows compatibility with `msvcrt`

[undeMalum]

Hi!

I have been using prezo for a while and really enjoying the experience!

However, since I'm on Windows, I need to turn to WSL in order to use prezo because termios module is not accessible on Windows.

I think the issue is caused by this piece of code:

# Wait for keypress
fd = sys.stdin.fileno()
old_settings = termios.tcgetattr(fd)
try:
    tty.setraw(fd)
    sys.stdin.read(1)
finally:
    termios.tcsetattr(fd, termios.TCSADRAIN, old_settings)

Would you be open to extending the support to Windows?

I could implement it with msvcrt.