pingIPAddress not working
I tried to use pingIPAddress, this is my config:

`{
                    "name": "Fernseher",
                    "type": "switch",
                    "pingIPAddress": "192.168.0.27",
            "data":{
                "on":"2600...",
                "off":"2600..."
          }`

But homebridge stopped and says:

`if (config.pingIPAddress) checkStateWithPing()
                              ^
ReferenceError: checkStateWithPing is not defined
`