title: CRA precache fails because of .LICENSE extension
body: <p>So, we have a situation where in production the precache is failing on our PWA because of a weird .LICENSE file on our server that is giving us 404</p>
  
  <p>specifically an error like this</p>
  
  <pre><code>uncaught (in promise) bad-precaching-response: bad-precaching-response :: [{"url"
  </code></pre>
  
  <p>How we can fix that?</p>