Adding clear cache button to settings

src/components/Footer.tsx

@@ -65,7 +65,7 @@ export class Footer extends Component<{}, { synced: boolean, syncing: boolean }>
                 Welcome <b>{Notes.name}</b>
             </span>
             <span style="color: lightgrey;">
-                v1.3
+                v1.4
             </span>
         </footer>
     }

src/components/routes/settings/Settings.tsx

@@ -18,6 +18,7 @@ export default class SettingsPage extends Page<{ state: any }, { vault: string }
             </header>
             <div class="container">
                 <button class="btn" onClick={() => Theme.toggle()}>Toggle Dark Mode</button>
+                <button class="btn" onClick={() => window.navigator.serviceWorker.controller.postMessage("clear_cache")}>Clear cache</button>
             </div>
         </div >;
     }