Update README.md

Readme.md

@@ -1,5 +1,5 @@
 # koa-better-static2
-[![Node version](https://img.shields.io/node/v/koa-better-static2.svg?style=flat)](http://nodejs.org/download/)
+[![Node version](https://img.shields.io/badge/Node-8.0.0-blue.svg)](http://nodejs.org/download/)
 [![Koajs deps](https://img.shields.io/badge/Koajs-2.3.0-brightgreen.svg)](https://github.com/koajs/koa)
 [![Build Status](https://travis-ci.org/uniibu/koa-better-static2.svg?branch=master)](https://travis-ci.org/uniibu/koa-better-static2)
 [![David deps](https://david-dm.org/uniibu/koa-better-static2.svg)](https://david-dm.org/uniibu/koa-better-static2)

example.js

@@ -1,23 +1,15 @@
-
 'use strict';
-
 const serve = require('./');
 const Koa = require('koa');
 const app = new Koa();
-
 // $ GET /package.json
 // $ GET /
-
 app.use(serve('.'));
-
-app.use((ctx, next) => {
-  return next().then(() => {
-    if ('/' == ctx.path) {
-      ctx.body = 'Try `GET /package.json`';
-    }
-  });
-})
-
+app.use(async (ctx, next) => {
+  await next();
+if ('/' == ctx.path) {
+  ctx.body = 'Try `GET /package.json`';
+}
+});
 app.listen(3000);
-
-console.log('listening on port 3000');
+console.log('listening on port 3000');