update readMe

Author: xujeff

README.md

@@ -20,6 +20,7 @@
     ![image](https://raw.githubusercontent.com/xujeff/tianti/master/screenshots/rolelist.png)
     ![image](https://raw.githubusercontent.com/xujeff/tianti/master/screenshots/menulist.png)                                              
     ![image](https://raw.githubusercontent.com/xujeff/tianti/master/screenshots/roleset.png)
+    ![image](https://raw.githubusercontent.com/xujeff/tianti/master/screenshots/updatePwd.png)
 
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