minor updates

templates/main.js

@@ -1,4 +1,4 @@
-import { init } from 'sapper/runtime/app.js';
+import { init } from 'sapper/runtime.js';
 
 // `routes` is an array of route objects injected by Sapper
 init(document.querySelector('#sapper'), __routes__);

templates/service-worker.js

@@ -1,4 +1,5 @@
-const ASSETS = `cache__timestamp__`;
+const timestamp = '__timestamp__';
+const ASSETS = `cache${timestamp}`;
 
 // `shell` is an array of all the files generated by webpack,
 // `assets` is an array of everything in the `assets` directory
@@ -60,7 +61,7 @@ self.addEventListener('fetch', event => {
 	// might prefer a cache-first approach to a network-first one.)
 	event.respondWith(
 		caches
-			.open('offline')
+			.open(`offline${timestamp}`)
 			.then(async cache => {
 				try {
 					const response = await fetch(event.request);