LYWSD02MMC not working

Hi,

I just added my LYWSD02MMC and I get the following error:

`RangeError [ERR_OUT_OF_RANGE]: The value of "offset" is out of range. It must be >= 0 and <= 14. Received 15`


### Versions
- **homebridge**: 1.2.4
- **homebridge-mi-hygrothermograph**: 3.0.3
- **node**:       `node --version`
- **OS**:         raspbian (raspberry pi 3b)

### Configuration
```
        {
            "name": "Termometro5",
            "address": "",
            "temperatureName": "Temperatura5",
            "humidityName": "Humedad5",
            "fakeGatoEnabled": true,
            "timeout": 15,
            "forceDiscovering": true,
            "forceDiscoveringDelay": 2500,
            "disableBatteryLevel": false,
            "lowBattery": 10,
            "temperatureOffset": 0,
            "humidityOffset": 0,
            "updateInterval": 10,
            "accessory": "Hygrotermograph"
        }
```

