Your docs insist that `SendGrid` class has an error and a response for parameters.  Can we update this or correct the docs in some way?  Seems like an error and response is pertinent.  Thanks SendGrid.

```
self.client.API(request, function(response) {
    try {
      response.body = response.body ? JSON.parse(response.body) : response.body;
    } catch (e) {
      return callback(e)
    }
    if (isValidResponse(response)) {
      callback(null, response);
    }
    else {
      var error = new SendGridError('Response error');
      error.response = response;
      callback(error, response);
    }
  });
```