Auto-format the settings file

src/index.tsx

@@ -1,4 +1,5 @@
 import React from 'react';
+import settings from 'electron-settings';
 import { render } from 'react-dom';
 import { QueryClient, QueryClientProvider } from 'react-query';
 import { Provider } from 'react-redux';
@@ -14,6 +15,11 @@ const queryClient = new QueryClient({
   },
 });
 
+settings.configure({
+  prettify: true,
+  numSpaces: 2,
+});
+
 render(
   <Provider store={store}>
     <QueryClientProvider client={queryClient}>