add babel-polyfill and rename compnent

Author: Orjiewuru Kingdom

package-lock.json

@@ -16,6 +16,7 @@
     "babel-core": "^6.26.3",
     "babel-jest": "^23.4.2",
     "babel-loader": "^7.1.5",
+    "babel-polyfill": "^6.26.0",
     "babel-preset-env": "^1.7.0",
     "babel-preset-react": "^6.24.1",
     "coveralls": "^3.0.2",

package.json

@@ -2,11 +2,11 @@ import React from 'react';
 import Header from './components/Header';
 import Content from './views/Content';
 
-const Main = () => (
+const App = () => (
   <div>
     <Header />
     <Content />
   </div>
 );
 
-export default Main;
+export default App;

src/app/App.js

@@ -1,3 +1,4 @@
+import 'babel-polyfill';
 import React from 'react';
 import ReactDOM from 'react-dom';
 import App from './app/App';