docs: update example

example/request.js

@@ -1,4 +1,4 @@
-var weRequest = require('../src/weRequest');
+import weRequest from '../src/index'
 
 weRequest.init({
     // [可选] 存在localStorage的session名称，且CGI请求的data中会自动带上以此为名称的session值；可不配置，默认为session
@@ -89,4 +89,4 @@ weRequest.init({
     sessionExpireKey: "sessionExpireKey"
 })
 
-module.exports = weRequest;
+export default weRequest;

package.json

@@ -19,8 +19,8 @@
     "type": "git",
     "url": "https://github.com/IvinWu/weRequest.git"
   },
-  "main": "build/weRequest.js",
+  "main": "src/index.ts",
-  "typings": "build/index.d.ts",
+  "typings": "src/typings/index.d.ts",
   "scripts": {
     "build": "webpack",
     "commit": "git cz"