Update README.md

I was using TypeScript and it was a little confusing why it wasn't working. If you don't use `Store` in app.ts it won't include the import so this simpler import statement will be less confusing for beginners

README.md

@@ -116,7 +116,7 @@ export default Spruce
 **app.js**
 
 ```javascript
-import Store from './store'
+import './store'
 import 'alpinejs'
 ```