How to setup SSH key authentication on Windows 10
### Backstory
Not an issue with the plugin, more with Homebridge and how it works on Windows 10

### Issue
I'm trying to use SSH to shutdown and wake my Mac. I can't pass in the password to my Mac through the SSH command, so I tried to set up SSH key authentication, but that doesn't work. I realize that this is out of the scope of this plugin, but I'm hoping someone can point me in the right direction.

### Environment
* os & os version: Windows 10
* node version: 12.14.0
* homebridge version: Unknown
* homebridge-wol version: 4.0.0

### Configuration
My configuration looks like this:
```
{
    "bridge": {
        "name": "Homebridge",
        "username": "<mac_address>",
        "port": 51068,
        "pin": "968-30-107"
    },
    "accessories": [
        {
            "accessory": "NetworkDevice",
            "name": "iMac",
            "mac": "<mac_address>",
            "ip": "<ip>",
            "pingInterval": 45,
            "wakeGraceTime": 10,
            "wakeCommand": "ssh <username>@<ip> caffeinate -u -t 300",
            "shutdownGraceTime": 15,
            "shutdownCommand": "ssh <username>@<ip> sudo shutdown -h now"
        }
    ],
    "platforms": [
        {
            "name": "WeMo Platform",
            "platform": "BelkinWeMo"
        }
    ]
}
```

### Log
```
[12/30/2019, 8:46:27 AM] Homebridge is running on port 51068.
[12/30/2019, 8:46:27 AM] [iMac] NetworkDevice "iMac" (10.0.0.145) went from status "Offline" to "Online"
[12/30/2019, 8:46:27 AM] [WeMo Platform] Online: Fan [94103E2CC8E4]
[12/30/2019, 8:46:27 AM] [WeMo Platform] Online: Room Light [6038E043B2A0]
[12/30/2019, 8:46:27 AM] [WeMo Platform] Online: 3D [94103E2CC624]
[12/30/2019, 8:46:28 AM] [WeMo Platform] Room Light - Get state: On
[12/30/2019, 8:46:29 AM] [Config] Homebridge Config UI X v4.6.7 is listening on :: port 8080
[12/30/2019, 8:46:51 AM] [iMac] NetworkDevice shutdown cycle started for "iMac" (10.0.0.145)
[12/30/2019, 8:46:51 AM] [iMac] NetworkDevice "iMac" (10.0.0.145) went from status "Online" to "Shutting Down"
[12/30/2019, 8:46:51 AM] [iMac] Attempting to shut down "iMac" (10.0.0.145) using "ssh"```
