Add Cloudflare IP Address support.

Hey There,

I just wanted to suggest an improvement. I run a local instance on my server and noticed that when the subdomain I have my instance running on through the cloudflare reverse proxy, that the logged IP addresses show the reverse proxy rather than the user's actual address. 

Could a small tweak be appended to the code to replace the `

$_SERVER["REMOTE_ADDR"]

 to a null coalesce operator to support this?

$_SERVER["HTTP_CF_CONNECTING_IP"] ?? $_SERVER["REMOTE_ADDR"]

Regards,

Ely.