Replacing 'HTTP' by 'HTTPS' for securing links
Currently, when we access github.com with HTTP, it is redirected to HTTPS automatically. So this commit aims to replace by for security.
//
// The take away: be mindful of this and don't blindly assume it's a good feature to have in your plugin.
//
-// See http://github.com/coredns/coredns/issues/2723 for some discussion on this, which includes this quote:
+// See https://github.com/coredns/coredns/issues/2723 for some discussion on this, which includes this quote:
//
// TL;DR: `fallthrough` is indeed risky and hackish, but still a good feature of CoreDNS as it allows to quickly answer boring edge cases.
//
