homebridge-people not working
Thanks for the work you do for this docker. I like the web interface feature. 

I recently had my homebridge installed in a Lubuntu install. Switched over to docker since it is easier to mange config files and updating, etc. This was all working fine before my switch (of course, that is how it also goes). Using exact same config and config has to errors. I do not believe this is an issue with the plugin, since it worked fine like previously mentioned. 

Container can ping my resolve DNS name and ping device ok, see below:
```
docker exec -it homebridge ping xxxxxxxxx.xxxxxx.net
PING xxxxxxxxx.xxxxxx.net (10.0.0.107): 56 data bytes
64 bytes from 10.0.0.107: seq=0 ttl=64 time=105.091 ms
64 bytes from 10.0.0.107: seq=1 ttl=64 time=26.441 ms
64 bytes from 10.0.0.107: seq=2 ttl=64 time=50.085 ms
```

Tried both IP and hostname in config for testing, still no go. 
```
        {
            "platform": "People",
            "threshold": 15,
            "anyoneSensor": true,
            "nooneSensor": false,
            "webhookPort": 51828,
            "pingInterval": 10000,
            "ignoreReEnterExitSeconds": 0,
            "people": [
                {
                    "name": "xxxxx",
                    "target": "10.0.0.107",
                    "threshold": 15,
                    "pingInterval": 10000,
                    "ignoreReEnterExitSeconds": 0
                },
                {
                    "name": "xxxxx",
                    "target": "xxxxxxx.xxxxx.net",
                    "threshold": 15,
                    "pingInterval": 10000,
                    "ignoreReEnterExitSeconds": 0
                }
            ]
```

Any other info needed, let me know. 