Error trying to update to v0.5.33
**Describe the bug**
When trying to update from v0.5.31 to v0.5.33 (via homebridge UI) I get the following error.

Should I be updating a different way?

![image](https://user-images.githubusercontent.com/3344008/108755263-e0ad5000-74fb-11eb-9719-2ea3e525d773.png)



**Expected behavior**
Update with no problems.

**To Reproduce**
Steps to reproduce the behavior:
1. ...
2. ...
3. ...

**Version** (output of `npm list -g homebridge homebridge-http-switch`)
 - homebridge: 1.1.6
 - homebridge-http-switch: 0.5.31

**Configuration**
```json
Your configuration goes in here
```

**Additional context**
Add any other context about the problem here.
