title: Symfony 3.4 does not refresh my updates
body: <p>I just start learning Symfony, I started with the version 3.4.
  The first issue I faced is that whatever I changed in the view .twig files, Symfony renders the previous one at all.</p>
  
  <p>I tried create a new twig. It displayed correctly, after that a changed its content but it does not respect any of my modification.</p>
  
  <p>I turned off cache in the httpd.conf and in the browser. I try to restart apache and try to check in other browsers. So the result is the same, so the culprit is must be the Symfony. The final miracle: I cannot find where are the cached files...</p>
  
  <p>Any idea?</p>