CO sensor keeps "updating" in home app

Hi!

First of all thank you for the amazing work. Do you guys have an idea what can I do wrong if my carbon monoxide service with one current value characteristic always shows "updating" in the home app? My other air quality sensor service works fine. Note that in HKAccessory.h the servicetype_airQualitySensor should be 0x8D not 0x8C, becouse 0x8C is for window cover.

Thank you guys,
Levi
