Devices aren't exposed to HomeKit
Hi there,

I'm having an issue where none of my devices appear in HomeKit.

I have installed the "homebridge-mi-aqara" package and homebridge seems to start properly:

```
[12/21/2018, 7:09:43 PM] Loaded plugin: homebridge-mi-aqara
[12/21/2018, 7:09:43 PM] Registering platform 'homebridge-mi-aqara.MiAqaraPlatform'
[12/21/2018, 7:09:45 PM] [MiAqaraPlatform] Initializing MiAqaraPlatform platform...
[12/21/2018, 7:09:45 PM] [MiAqaraPlatform] [DEBUG]loading parsers from: /usr/local/lib/node_modules/homebridge-mi-aqara/parser
[12/21/2018, 7:09:45 PM] [MiAqaraPlatform] [INFO]**************************************************************
[12/21/2018, 7:09:45 PM] [MiAqaraPlatform] [INFO]           MiAqaraPlatform v0.8.0 By YinHang
[12/21/2018, 7:09:45 PM] [MiAqaraPlatform] [INFO]  GitHub: https://github.com/YinHangCode/homebridge-mi-aqara  
[12/21/2018, 7:09:45 PM] [MiAqaraPlatform] [INFO]                                         QQ Group: 107927710  
[12/21/2018, 7:09:45 PM] [MiAqaraPlatform] [INFO]**************************************************************
[12/21/2018, 7:09:45 PM] [MiAqaraPlatform] [INFO]start success...
[12/21/2018, 7:09:45 PM] [MiAqaraPlatform] [INFO]config gateways: 04cf8c744031
[12/21/2018, 7:09:45 PM] [MiAqaraPlatform] [INFO]binding to the default interface
[12/21/2018, 7:09:45 PM] [MiAqaraPlatform] [DEBUG][Send]{"cmd": "whois"}
[12/21/2018, 7:09:45 PM] [MiAqaraPlatform] [INFO]Aqara LAN protocol server is listening on port: 9898

```
If I push the button on a temperature sensor, I see:

```
[12/21/2018, 7:12:28 PM] [MiAqaraPlatform] [DEBUG][Revc]{"cmd":"report","model":"weather.v1","sid":"158d0002b54652","short_id":9637,"data":"{\"temperature\":\"2179\"}"}
[12/21/2018, 7:12:28 PM] [MiAqaraPlatform] [DEBUG][Revc]{"cmd":"report","model":"weather.v1","sid":"158d0002b54652","short_id":9637,"data":"{\"humidity\":\"4536\"}"}
[12/21/2018, 7:12:28 PM] [MiAqaraPlatform] [DEBUG][Revc]{"cmd":"report","model":"weather.v1","sid":"158d0002b54652","short_id":9637,"data":"{\"pressure\":\"97778\"}"}
```

If I seperate a door/window sensor, I see:

```
[12/21/2018, 7:13:13 PM] [MiAqaraPlatform] [DEBUG][Revc]{"cmd":"report","model":"sensor_magnet.aq2","sid":"158d000274fe87","short_id":4991,"data":"{\"status\":\"open\"}"}
[12/21/2018, 7:13:16 PM] [MiAqaraPlatform] [DEBUG][Revc]{"cmd":"report","model":"sensor_magnet.aq2","sid":"158d000274fe87","short_id":4991,"data":"{\"status\":\"close\"}"}
```

So it looks like homebridge sees the actions, but none of the devices appear in HomeKit. I've tried rolling back to 0.6.9, and I've tried manually assigning defaultValues to the temperature sensor in the config.json file but nothing appears. I've also tried clearing my registered accessories.

If I activate/use the MiAqara Manage web portal, I only see the gateway (see attached image).

<img width="1016" alt="screen shot 2018-12-21 at 7 20 09 pm" src="https://user-images.githubusercontent.com/46060118/50369070-84ce9180-0555-11e9-93d9-6351033a4872.png">

Please help! Thank you.