Update tic-tac-toe to the latest version

[StorytellerCZ]

Updated the tic-tac-toe example to the latest Meteor. Not sure who has originally deployed it as I was not able to do so in order to fix #31.

[Grubba27]

hello there. Made it work :) https://tic-tac-toe-example.meteorapp.com/

changed main.jsx file like this:

import React from 'react';
import { Meteor } from 'meteor/meteor';
import { App } from '/imports/ui/App';
import * as ReactDOM from "react-dom";

Meteor.startup(() => {

  const root = document.getElementById('react-target')
  ReactDOM.render(<App />, root)

});

also, on deploy, I used this command: meteor deploy tic-tac-toe-example.meteorapp.com --mongo so that meteor cloud could create a mongo DB for me

[StorytellerCZ]

@Grubba27 the question is who holds tic-tac-toe.meteorapp.com

[Grubba27]

Updated. Guess all works! Can I merge this PR or is there something left ?

[StorytellerCZ]

@Grubba27 ready to be merged