fix: repair example (#502)

Author: luozhang002

example/package.json

@@ -26,7 +26,7 @@
     "babel-loader": "^7.1.4"
   },
   "dependencies": {
-    "ali-oss": "^5.2.0",
+    "ali-oss": "^6.0.0",
     "bootstrap": "^4.1.1",
     "jquery": "^3.3.1"
   }

example/src/main.js

@@ -3,6 +3,8 @@
 require('./style.css')
 const $ = require('jquery');
 // if use in react , you can use require('ali-oss/dist/aliyun-oss-sdk.js'), or see webpack.prod.js
+// import local for test
+// const OSS = require('../../lib/browser.js');
 const OSS = require('ali-oss');
 const crypto = require('crypto');