improve document

CHANGELOG.MD

 # 更新日志
+## 2.1.3 | 2017.4.6
+改善文档
+
+
 ## 2.1.0 | 2017.4.6
 增加获取评论接口以及对应单元测试,增加更新日志
 

README.MD

@@ -36,11 +36,12 @@ $ node app.js
 
 ## 更新日志
 [changelog](https://github.com/Binaryify/NeteaseCloudMusicApi/blob/master/CHANGELOG.MD)  
+
 ## 单元测试
 
 ``` shell
 $ npm test
-```
+```  
 
 ![单元测试](https://raw.githubusercontent.com/Binaryify/NeteaseCloudMusicApi/master/static/screenshot1.png)
 ![单元测试](https://raw.githubusercontent.com/Binaryify/NeteaseCloudMusicApi/master/static/screenshot2.png)

package.json

 {
   "name": "NeteaseCloudMusicApi",
-  "version": "2.1.2",
+  "version": "2.1.3",
   "description": "",
   "scripts": {
     "start": "node app.js",