Enrico Foltran

Implement a simple throttling middleware based on [`time.Ticker`](https://golang.org/pkg/time/#Ticker) as described in this [article](https://rodaine.com/2017/05/x-files-time-rate-golang/). This method has [issues and limitations](https://github.com/golang/go/wiki/RateLimiting), do not use for anythings other than experiments.