error after upgrading to 0.4.8
I get the following error after upgrading to 0.4.8:

`/usr/lib/node_modules/homebridge-harmony/harmonyBase.js:594
        callback(undefined, false);
        ^
Error: This callback function has already been called by someone else; it can only be called one time.
    at /usr/lib/node_modules/homebridge/node_modules/hap-nodejs/lib/util/once.js:12:13
    at HarmonyBase.<anonymous> (/usr/lib/node_modules/homebridge-harmony/harmonyBase.js:594:9)
    at Characteristic.On.emit (events.js:202:15)
    at Characteristic.On.Characteristic.getValue (/usr/lib/node_modules/homebridge/node_modules/hap-nodejs/lib/Characteristic.js:164:10)
    at Bridge.<anonymous> (/usr/lib/node_modules/homebridge/node_modules/hap-nodejs/lib/Accessory.js:762:20)
    at Array.forEach (<anonymous>)
    at Bridge.Accessory._handleGetCharacteristics (/usr/lib/node_modules/homebridge/node_modules/hap-nodejs/lib/Accessory.js:726:8)
    at HAPServer.emit (events.js:197:13)
    at HAPServer._handleCharacteristics (/usr/lib/node_modules/homebridge/node_modules/hap-nodejs/lib/HAPServer.js:926:10)
    at HAPServer.<anonymous> (/usr/lib/node_modules/homebridge/node_modules/hap-nodejs/lib/HAPServer.js:209:39)
    at IncomingMessage.emit (events.js:197:13)
    at endReadableNT (_stream_readable.js:1129:12)
    at processTicksAndRejections (internal/process/next_tick.js:76:17)`

I only changed the "inverted" option... if I set it back to true it is the same....

My config:
`        {
            "platform": "HarmonyHubWebSocket",
            "name": "HarmonyHub",
            "hubIP": "XXX",
            "showTurnOffActivity": "inverted",
            "turnOffActivityName": "Media",
            "devicesToPublishAsAccessoriesSwitch": [
                "Beleuchtung TV;PowerOn",
                "Beleuchtung TV;PowerOff",
                "Yamaha AVR;VolumeUp",
                "Yamaha AVR;VolumeDown",
                "Beleuchtung Theke;PowerToggle"
            ]
        }`