People API

I have authorized `https://www.googleapis.com/auth/contacts`, though I still receive the error:

```
$ gws people people searchContacts --params '{"query":"","readMask":"names,emailAddresses"}'
{
  "error": {
    "code": 403,
    "message": "Request had insufficient authentication scopes.",
    "reason": "unknown"
  }
}
```

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The same query works in API Explorer.