Change dev-server port: 8001 ~> 8000

The project only has a dev-server, so 8000 makes more sense.

Author: Oblosys

README.md

@@ -41,7 +41,7 @@ npm install
 npm start
 ```
 
-The demo runs on http://localhost:8001/.
+The demo runs on http://localhost:8000/.
 
 
 ## Using the npm package

webpack.config.js

@@ -1,6 +1,6 @@
 const path = require('path');
 
-const devServerPort = 8001;
+const devServerPort = 8000;
 
 module.exports = {
   entry: path.join(__dirname, 'examples/parent-child-demo/src/index.js'),