No termios on windows

Hi,

bullet doesn’t work on Windows as there is no termios module. I get the following stack trace when trying to run this example code under CPython 3.7.2 on Windows 10 v1803 Enterprise.

Traceback (most recent call last):
  File "h:\Python\Misc\bullet_test.py", line 1, in <module>
    from bullet import Bullet
  File "C:\Program Files\Python37\lib\site-packages\bullet\__init__.py", line 1, in <module>
    from .client import Bullet
  File "C:\Program Files\Python37\lib\site-packages\bullet\client.py", line 4, in <module>
    from . import utils
  File "C:\Program Files\Python37\lib\site-packages\bullet\utils.py", line 3, in <module>
    import tty, termios
  File "C:\Program Files\Python37\lib\tty.py", line 5, in <module>
    from termios import *
ModuleNotFoundError: No module named 'termios'

Confirmed from the ipython shell directly using the import command.

In [1]: import bullet
---------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
<ipython-input-1-14022d50bf52> in <module>
----> 1 import bullet

c:\program files\python37\lib\site-packages\bullet\__init__.py in <module>
----> 1 from .client import Bullet

c:\program files\python37\lib\site-packages\bullet\client.py in <module>
      2 from .charDef import *
      3 from . import colors
----> 4 from . import utils
      5 from . import cursor
      6

c:\program files\python37\lib\site-packages\bullet\utils.py in <module>
      1 import os
      2 import sys
----> 3 import tty, termios
      4 import string
      5 from .charDef import *

c:\program files\python37\lib\tty.py in <module>
      3 # Author: Steen Lumholt.
      4
----> 5 from termios import *
      6
      7 __all__ = ["setraw", "setcbreak"]

ModuleNotFoundError: No module named 'termios'