[Bug] Shelly Plus US (Plus) Not showing up
**Describe the bug**
I am currently using a different Shelly Plugin for HOOBS that was working flawlessly. 
I added a Shelly Plug US (Plus) to my collection and it does not show up in Homekit.
I noticed this plugin supports the Plus US, but it doesn't show up in Homekit either while all my other devices do.
Am I missing something? Perhaps the PLUS is the issue?
Thanks.

**Log output**
Add any relevant parts from the homebridge log here, if applicable.

**Environment:**
 - Shelly device(s): Only the Plug US Plus is not working
 - Plugin version: 0.19.1
 - Device running homebridge: HOOBS on a RPi
