Access key/token improperly parsed
plugin 1.1.7
node 14.17

After proper setup following this tutorial: https://developer.tuya.com/en/docs/iot/Tuya_Homebridge_Plugin?id=Kamcldj76lhzt

`accessKey` in config.json seems to be parsed incorrectly: 
![image](https://user-images.githubusercontent.com/6688713/120914325-b91d6600-c65a-11eb-9c01-0231a0abfb1f.png)

when `accessKey` is changed to `accessToken`, a different error occurs:
```
{
    "bridge": {
        "name": "Homebridge 4547",
        "username": "***********************",
        "port": ***********************,
        "pin": "***********************"
    },
    "accessories": [],
    "platforms": [
        {
            "name": "Config",
            "port": 8581,
            "platform": "config"
        },
        {
            "options": {
                "username": "***********************",
                "password": "***********************",
                "accessId": "***********************",
-                 "accessKey": "6"***********************"b",
+                "accessToken": "6"***********************"b",
                "lang": "en",
                "projectType": "2",
                "appSchema": "tuyaSmart",
                "endPoint": "https://openapi.tuyaus.com",
                "countryCode": 123456,
                "debug": true
            },
            "name": "TuyaPlatform",
            "platform": "TuyaPlatform"
        }
    ]
}
```
![image](https://user-images.githubusercontent.com/6688713/120914364-1fa28400-c65b-11eb-85ee-dd3e6d9946d1.png)

