Homebridge Config UI X is lost when installing Shelly
Hi, first of all, congrats for you work.

I installed your plugin twice, one from the interface and another one with SSH and I got the same problem which is losing the Homebridge Config UI X

![Picture1](https://user-images.githubusercontent.com/15309579/71561695-b5eb7700-2a71-11ea-855f-865ca9899e35.jpg)

![Picture2](https://user-images.githubusercontent.com/15309579/71561696-bd128500-2a71-11ea-874d-087e74bd11f3.jpg)

Picture 1 is before the installation and picture 2 after. I added the json code as documented and validated it:
  {
    "platform": "Shelly",
    "name": "Shelly"
  }

Any clue of what I am doing wrong or is it like this ?

Thanks.
