error undefined after install 9.4.0
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# Bug Report

### Describe the Bug
error undefined after install 9.4.0.
i try to get another token even if i had one since the beggining, but now the response is undefined if i try to install older version the response is the same.

### To Reproduce
Steps to reproduce the behavior:
 - Start Homebridge
 - Attempt to ...
 - See error

### Expected behavior
<!-- ✍️edit: --> A clear and concise description of what you expected to happen.


### Screenshots/Logs
[7/5/2020, 7:31:13 AM] [Ring] Request to https://app.ring.com/rhq/v1/devices/v1/locations failed with status undefined. Response body: undefined
[7/5/2020, 7:31:13 AM] [Ring] Error connecting to API
[7/5/2020, 7:31:13 AM] [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:116:15)
    at RingRestClient.<anonymous> (/usr/local/lib/node_modules/homebridge-ring/lib/api/rest-client.js:120:36)
    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:119:16)
    at RingRestClient.refreshAuth (/usr/local/lib/node_modules/homebridge-ring/lib/api/rest-client.js:214:33)
    at RingRestClient.<anonymous> (/usr/local/lib/node_modules/homebridge-ring/lib/api/rest-client.js:231:26)
    at Generator.throw (<anonymous>)

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

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

HIGHLIGHT THIS TEXT AND POST CONFIG HERE
DO NOT INCLUDE YOUR REFRESH TOKEN OR EMAIL/PASSWORD (replace them with xxx)

```

### Environment
<!-- ✍️edit: -->
 - OS: mac catalina
 - Node.js: 14.0.0
 - NPM: 6.14.4
 - homebridge-ring:9.4.0
 - homebridge: 1.1.1
 - hoobs: [e.g. 0.4.50 or N/A]
