win32: asyncio sigint trap failure

[lo5]

Via @dipplestix

listen() fails on win32:

Traceback (most recent call last):
  File "examples/tour.py", line 204, in <module>
    listen('/tour', main)
  File "C:\Users\Chris\Downloads\qd-0.1.4-windows-amd64\venv\lib\site-packages\h2o_q\server.py", line 192, in listen
    el.add_signal_handler(signal.SIGINT, stop_server.set_result, None)
  File "C:\Users\Chris\Anaconda3\lib\asyncio\events.py", line 540, in add_signal_handler
    raise NotImplementedError
NotImplementedError

Notes
python/asyncio#407
SO

[lo5]

Shouldn't happen from 0.9+ since the uvicorn migration.