SmartThings not Updating Unavailable Devices
When any bulb changes status to unavailable, the plugin keep the bulb ON. It could at least change it to off. If I turn any of these bulbs off, they turn back on.

Every bulb in the following screen shot are unavailable in Smartthings, but still ON in Hoobs and Home app:

![Screen Shot 2021-07-08 at 11 49 12](https://user-images.githubusercontent.com/4246424/124943054-890f0d00-dfe2-11eb-86f4-fd5f31f5d630.png)
