Regular fetch only once every 30 seconds

src/Fetcher.js

@@ -21,7 +21,7 @@ class Fetcher extends React.Component {
     if (!this.props.oneShot) {
       this.timerID = setInterval(
         () => this.fetch(),
-        10000 // every 10 seconds
+        30000 // every 30 seconds
       );
     }
   }