title: How to update Jest testing framework in create-react-app?
body: <p>I already have an application created with <a href="https://github.com/facebookincubator/create-react-app" rel="noreferrer"><code>create-react-app</code></a> package.
  I found a bug with the version of Jest which is 15.1.1. But I realized that in version 16 the bug is gone.</p>
  
  <p>How to update Jest?</p>
  
  <p>My problem is in the <em>package.json</em> of application there is no Jest package.</p>
  
  <p>Jest is in other folder: <em>node_modules/react-scripts</em>.</p>