Add https compatibility to Server

[msholty-fd]

As of now, interface ServerOptions asks for an http object. I would like it to accept https as well as http

Is it as easy as changing the interface definition to the following code?

import * from 'https';
export interface ServerOptions {
  server?: http.Server|https.Server;
  port?: number;
  ws?: WebSocketServer;
}

If so I'd be happy to make a PR. If you foresee other issues popping up, let me know and I can also make those changes.

Thanks!

[msholty-fd]

#39 opened to get this ball rolling