Metrics endpoint with HTTPS

[jobetinfosec]

Hi,
I've been using PHP-FPM Exporter for a few weeks, and I must say that it's great!
However I noticed that the metrics endpoint is exposed only over http.
As I have other exporters (i.e. Telegraf) that exposes their metrics over https, I was wondering if your exporter could be set over https as well.
Regards

[Lusitaniae]

Feel free to submit a PR, its unlikely I will be working on that for the time being.