message: add twitter links
diff: @@ -128,6 +128,9 @@ const siteConfig = {
  siteConfigUrl:
  'https://github.com/facebook/jest/edit/master/website/siteConfig.js',
  cleanUrl: true,
  + twitter: true,
  + twitterUsername: 'fbjest',
  + twitterImage: 'img/jest.png',
  };
  module.exports = siteConfig;
  