Update README.md

Author: think2011

README.md

@@ -1,22 +1,22 @@
 webchatHelper
 =============
 
-一个微信群发信息的chrome扩展
+# 一个微信群发信息的chrome扩展
 
-version 1.5
+## version 1.5
 
-![](https://github.com/think2011/webchatHelper/raw/master/img/demo.gif);
+![](https://github.com/think2011/webchatHelper/raw/master/img/demo.gif)
 
-![](https://github.com/think2011/webchatHelper/raw/master/img/1.png);
+![](https://github.com/think2011/webchatHelper/raw/master/img/1.png)
 
-![](https://github.com/think2011/webchatHelper/raw/master/img/2.png);
+![](https://github.com/think2011/webchatHelper/raw/master/img/2.png)
 
-![](https://github.com/think2011/webchatHelper/raw/master/img/3.png);
+![](https://github.com/think2011/webchatHelper/raw/master/img/3.png)
 
-![](https://github.com/think2011/webchatHelper/raw/master/img/4.png);
+![](https://github.com/think2011/webchatHelper/raw/master/img/4.png)
 
-![](https://github.com/think2011/webchatHelper/raw/master/img/5.png);
+![](https://github.com/think2011/webchatHelper/raw/master/img/5.png)
 
-version 3
+## version 3
 
-![](https://github.com/think2011/webchatHelper/raw/master/img/new-demo.gif);
+![](https://github.com/think2011/webchatHelper/raw/master/img/new-demo.gif)