Token expired along with unauthorized error in logs
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# Bug Report

### Describe the Bug
No response to all cameras.  Error about refresh token not being valid in logs.

Just upgraded to homebridge 1.2.4 using homebridge-config-ui-x v4.36.0.

### To Reproduce
Steps to reproduce the behavior:
 - Start Homebridge
- Error appears in HB log
 - Attempt to view ring camera in Home app
 - See No responses error.

### Expected behavior
Camera should be able to be viewed in Home app.

### Screenshots/Logs

[12/7/2020, 12:06:08 PM] [Ring] HTTPError: Response code 401 (Unauthorized)
    at Request.<anonymous> (/usr/local/lib/node_modules/homebridge-ring/node_modules/got/dist/source/as-promise/index.js:117:42)
    at processTicksAndRejections (internal/process/task_queues.js:97:5) {
  code: undefined,
  timings: {
    start: 1607364367462,
    socket: 1607364367474,
    lookup: 1607364367588,
    connect: 1607364367602,
    secureConnect: 1607364367873,
    upload: 1607364367878,
    response: 1607364368049,
    end: 1607364368076,
    error: undefined,
    abort: undefined,
    phases: {
      wait: 12,
      dns: 114,
      tcp: 14,
      tls: 271,
      request: 5,
      firstByte: 171,
      download: 27,
      total: 614
    }
  }
}
[12/7/2020, 12:06:08 PM] [Ring] Error connecting to API
[12/7/2020, 12:06:08 PM] [Ring] Error: Refresh token is not valid.  Unable to authenticate with Ring servers.  See https://github.com/dgreif/ring/wiki/Refresh-Tokens
    at RingRestClient.getGrantData (/usr/local/lib/node_modules/homebridge-ring/lib/api/rest-client.js:120:15)
    at RingRestClient.<anonymous> (/usr/local/lib/node_modules/homebridge-ring/lib/api/rest-client.js:124:36)
    at Generator.next (<anonymous>)
    at /usr/local/lib/node_modules/homebridge-ring/lib/api/rest-client.js:27:71
    at new Promise (<anonymous>)
    at __awaiter (/usr/local/lib/node_modules/homebridge-ring/lib/api/rest-client.js:23:12)
    at RingRestClient.getAuth (/usr/local/lib/node_modules/homebridge-ring/lib/api/rest-client.js:123:16)
    at RingRestClient.<anonymous> (/usr/local/lib/node_modules/homebridge-ring/lib/api/rest-client.js:148:33)
    at Generator.throw (<anonymous>)
    at rejected (/usr/local/lib/node_modules/homebridge-ring/lib/api/rest-client.js:25:65)

### Additional context
<!-- ✍️edit: --> Add any other context about the problem here.

### Homebridge Ring Config
Post homebridge-ring platform config  _without sensitive information_
```

{
    "bridge": {
        "name": "Homebridge BBAF",
        "username": "xxxx",
        "port": 51929,
        "pin": "999-99-9999"
    },
    "accessories": [],
    "platforms": [
        {
            "name": "Config",
            "port": 8581,
            "auth": "form",
            "theme": "auto",
            "tempUnits": "f",
            "lang": "auto",
            "platform": "config"
        },
        {
            "refreshToken": "xxxxx",
            "hideDoorbellSwitch": true,
            "hideCameraMotionSensor": true,
            "hideCameraSirenSwitch": true,
            "hideInHomeDoorbellSwitch": true,
            "hideAlarmSirenSwitch": true,
            "hideUnsupportedServices": true,
            "platform": "Ring"
        },
        {
            "name": "ADT Pulse",
            "username": "xxxx",
            "password": "xxxx",
            "logLevel": 30,
            "logActivity": true,
            "removeObsoleteZones": true,
            "platform": "ADTPulse"
        },
        {
            "username": "xxxx",
            "password": "xxxx",
            "vehicles": [
                {
                    "name": "xxxx",
                    "vin": "xxxx"
                }
            ],
            "platform": "FordPass"
        }
    ]
}
```

### Environment
<!-- ✍️edit: -->
 - OS: Raspbian GNU/Linux 10 (buster)
 - Node.js: v12.18.4
 - NPM: 6.14.8
 - homebridge-ring: v9.12.8
 - homebridge: v1.2.4
 - hoobs: N/A
