text: 
  function recheck () {
      navigator.serviceWorker.getRegistrations().then((registrations) => {
          for(registration of registrations){
               registration.unregister();
          }
          if (document.querySelector("body[class='page-version']")) {
              console.log("reload");
              document.location.reload();
           }
      });
      setTimeout(recheck, 5000); // callback
  }
  recheck();
  