Hostname is not checked against SSL certificate

[thegrumble]

SSL certificates are checked to be valid, but no attempt is made to match the hostname against the hostname(s) the SSL certificate is valid for.

I implemented a quick fix for this: https://github.com/xnrand/Atomic/commit/e2ed609735d3b628bdf4c15eea7e63b1d30174b
It's not polished enough for a pull request, and I haven't tested it against anything other than Marshmallow, but I hope it helps 😄