fix: add .catch() to SW activate event

sw.js

@@ -13,7 +13,7 @@ self.addEventListener('activate', e => {
     e.waitUntil(
         caches.keys().then(keys =>
             Promise.all(keys.filter(k => k !== CACHE).map(k => caches.delete(k)))
-        )
+        ).catch(err => console.warn('[SW] activate error', err))
     );
     self.clients.claim();
 });