Switch Status failure
### Backstory
Just playing a little bit with Homebridge and wanted to start my Win10 PC in the cellar via WOL.

### Issue
If I press the button in the Apple home app, it turn on my PC and it is starting. The Homebridge Log shows the message 

[Windows PC] NetworkDevice awake cycle started for "Windows PC" (192.168.178.33)
[Windows PC] Attempting to wake up "Windows PC" (192.168.178.33)
[Windows PC] NetworkDevice "Windows PC" (192.168.178.33) went from status "Offline" to "Waking Up"

After a while, the switch turn off again with the message (in home bridge log)

[Windows PC] NetworkDevice "Windows PC" (192.168.178.33) went from status "Waking Up" to "Offline"

The Windows PC stays turned on and I also can use Remote Desktop to connect to it.

### Environment
* homebridge version: 0.4.50
* homebridge-wol version: 3.2.4

### Configuration
My configuration looks like this:
{
            "accessory": "NetworkDevice",
            "name": "Windows PC",
            "mac": "<MAC>",
            "ip": "192.168.178.33",
            "shutdownCommand": "net rpc shutdown --ipaddress 192.168.178.33 --user user&password"
        }