Require pyserial-asyncio newer than 0.5

[Hedda]

pyserial-asyncio is required by recommend newer than pyserial-asyncio 0.5 (ie. 0.6 or later) as 0.5 is broken on Windows OS.

Due to known issue with pyserial-asyncio 0.5 on Windows OS -> pyserial/pyserial-asyncio#69

https://github.com/zigbeefordomoticz/Domoticz-Zigbee/blob/stable6/requirements.txt

See example zigpy-znp config which exclude use of pyserial-asyncio 0.5 version :

https://github.com/zigpy/zigpy-znp/blob/dev/setup.cfg

install_requires =
    pyserial-asyncio; platform_system!="Windows"
    pyserial-asyncio!=0.5; platform_system=="Windows"  # 0.5 broke writes

Alternative is to just set pyserial-asyncio 0.6 as the requirement, that is what Home Assistant core does for ZHA component:

https://github.com/home-assistant/core/blob/dev/requirements_all.txt#L1784

# homeassistant.components.serial
# homeassistant.components.zha
pyserial-asyncio==0.6

[pipiche38]

Thanks very much