docs: update

Author: yugasun

README.md

@@ -20,21 +20,21 @@ npm install tencent-serverless-http
 ```js
 // handler.js
 'use strict';
-const tencentServerlessNodejs = require('tencent-serverless-http');
+const tencentServerlessHttp = require('tencent-serverless-http');
 const app = require('./app');
-const server = tencentServerlessNodejs.createServer(app);
+const server = tencentServerlessHttp.createServer(app);
 
 exports.handler = (event, context) => {
-  tencentServerlessNodejs.proxy(server, event, context);
+  tencentServerlessHttp.proxy(server, event, context);
 };
 ```
 
 This package includes middleware to easily get the event object Lambda receives
 from API Gateway
 
 ```js
-const tencentServerlessNodejsMiddleware = require('tencent-serverless-http/middleware');
-app.use(tencentServerlessNodejsMiddleware.eventContext());
+const tencentServerlessHttpMiddleware = require('tencent-serverless-http/middleware');
+app.use(tencentServerlessHttpMiddleware.eventContext());
 app.get('/', (req, res) => {
   res.json(req.apiGateway.event);
 });