update sw.js

src/sw.js

@@ -9,7 +9,7 @@ self.addEventListener("message", (event) => {
 
 workbox.routing.registerRoute(
   new RegExp('/*'),
-  new workbox.strategies.StaleWhileRevalidate({
+  new workbox.strategies.CacheFirst({
     cacheName: CACHE
   })
 );