ReferenceError: e is not defined

[davidpellerin]

I believe I might have found an error in the Questrade.prototype._api function:

The code in question looks like this:

  request(opts, function (err, http, response) {
    if (err) {
      return cb({
        message: 'api_call_failed',
        url: self.apiUrl + endpoint,
        method: method,
        details: e
      });
    }
    cb(null, response);
  });

but e is never defined anywhere. I believe that the value of details should be err

am I ok to make a PR for this?