twitter user id null
Hello again, when getting the profile for twitter, I'm getting this error: 
```
TypeError: Cannot read property 'user_id' of undefined
    at Object.twitter (\node_modules\grant\lib\profile.js:101:53)
```
`twitter: ({output}) => ({qs: {user_id: output.raw.user_id}}),`

and this is my config : 
```
"twitter": {
        "key": "",
        "secret": "",
        "callback": "/callback",
        "scope": ["read", "write"],
        "response": ["tokens", "profile"]
    }
```