title: React child component does re-render when prop changes value
body: <p>As per title, my React child component does not re-render when a prop changes value. I have created an example here:</p>
  
  <p><a href="https://codesandbox.io/s/x9mzwnj04p" rel="nofollow noreferrer">https://codesandbox.io/s/x9mzwnj04p</a></p>
  
  <p>I tried using ComponentWillReceiveProps but it does not get called.</p>