express middleware filter out localhost api calls
I'm running a Cluster/Worker configuration and I do internal api calls to `localhost`. Having configured the rate limiter as a express middleware, I get these internal api calls limited too:

```javascript
const rateLimiterMiddleware = (req, res, next) => {
                rateLimiter.consume(req.connection.remoteAddress)
                    .then(() => {
                        next();
                    })
                    .catch(_ => {
                        var errorMessage = APIHelper.createErrorMessage(429, '', '', 'Too Many Requests');
                        res.status(429).send(errorMessage);
                    });
            };
            self.app.use(rateLimiterMiddleware);
```

It would be possibile to filter out `localhost` / `127.0.0.1` IP address so that the middleware would skip these internal api calls?