asyncio issue with Tornado, python 3.8 and windows

[pythononwheels]

See here:
tornadoweb/tornado#2751

[pythononwheels]

Solution taken form the proposal:

added:import asyncio

if sys.platform == 'win32':
    asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())

works as of 14 november 2019

[pythononwheels]

solved with the above correction.