A NodeJS WebSocket Tic Tac Toe Server
https://hidden-falls-43709.herokuapp.com/
- https://devcenter.heroku.com/articles/node-websockets
- https://github.com/websockets/ws
- https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_API/Writing_WebSocket_servers
- https://developer.mozilla.org/en-US/docs/Web/API/WebSocket/readyState
- https://davidwalsh.name/es6-generators
- https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/function*
- https://jakearchibald.com/2017/async-iterators-and-generators/
- https://medium.com/front-end-hacking/modern-javascript-and-asynchronous-programming-generators-yield-vs-async-await-550275cbe433