title: react jest confirming snapshot change
body: <p>I am newbie at React and I can not find a solution for a simple problem. 
  I am using <code>create-react-app</code> and I succeed to operate jest snapshot test. Then, for trying I changed <code>render()</code> function's inside. Now jest said me <code>× has a valid snapshot (5ms)</code> (I know it is normal.) and it says me:</p>
  
  <blockquote>
    <p>1 snapshot test failed in 1 test suite. Inspect your code changes or
    press <code>u</code> to update them.</p>
  </blockquote>
  
  <p>I don't know how can I update it. I tried to pressing u, <kbd>ctrl</kbd> + <kbd>u</kbd> and other combinations. But nothing changed in there. I know it is silly question but How can I update them?</p>