changed interval to 4 sec

src/App.js

@@ -18,7 +18,7 @@ class App extends Component {
   // is called once when loading the page
   componentDidMount() {
     this.reloadLocations();
-    setInterval(this.updateLocation, 10000);
+    setInterval(this.updateLocation, 4000);
   }
   
   reloadLocations = () => {