Remove differences between webpack and parcel samples

sample/parcel/Sample.jsx

@@ -1,5 +1,6 @@
 import React, { Component } from 'react';
 import { Document, Page } from 'react-pdf/dist/entry.parcel';
+import 'react-pdf/dist/Page/AnnotationLayer.css';
 
 import './Sample.less';
 

sample/webpack/Sample.jsx

@@ -1,5 +1,4 @@
 import React, { Component } from 'react';
-import { render } from 'react-dom';
 import { Document, Page } from 'react-pdf/dist/entry.webpack';
 import 'react-pdf/dist/Page/AnnotationLayer.css';
 
@@ -10,7 +9,7 @@ const options = {
   cMapPacked: true,
 };
 
-class Sample extends Component {
+export default class Sample extends Component {
   state = {
     file: './sample.pdf',
     numPages: null,
@@ -67,5 +66,3 @@ class Sample extends Component {
     );
   }
 }
-
-render(<Sample />, document.getElementById('react-container'));

sample/webpack/index.jsx

@@ -0,0 +1,5 @@
+import React from 'react';
+import { render } from 'react-dom';
+import Sample from './Sample';
+
+render(<Sample />, document.getElementById('react-container'));