Update Readme.

Author: soloopooo

Readme.Zh_cn.md

@@ -20,6 +20,8 @@
 4. 双击 start.bat 运行。
 5. 浏览器打开 http://127.0.0.1:8919。
 
+** 更推荐使用Websocket版本，而非Js轮询版本。 **
+
 结束。
 
 ## 如何自定义可视化 html:
@@ -34,4 +36,6 @@
 
 ## 寻求帮助
 
-Websocket咋用啊?
+<s>Websocket咋用啊?</s>
+
+暂时没了...

Readme.md

@@ -20,6 +20,8 @@ Thanks to [jlennox/Heartrate](https://github.com/jlennox/HeartRate).
 4. Run Start.bat.
 5. Open http://127.0.0.1:8919.
 
+** Recommend using WebSocket than Js API. **
+
 All Right.
 
 ## How to make your own visualble html:
@@ -34,4 +36,7 @@ Open http://127.0.0.1:8919/{yourhtmlname}.html to see it.
 
 ## Asking for help
 
-Maybe we can use websocket?
+<s>Maybe we can use websocket?</s>
+
+Finished...?
+