refactor(app component): change app struture

src/app.jsx

@@ -1,14 +0,0 @@
-import React, { Component } from 'react';
-
-export default class App extends Component{
-
-    constructor(props){
-        super(props);
-    }
-
-    render(){
-        return(
-            <h1>Hello This is Post App modified</h1>
-        )
-    }
-}