Update README.md

Author: pedant

README.md

@@ -24,6 +24,10 @@ Safe Java-JS WebView Bridge
         compile 'cn.pedant.safewebviewbridge:library:1.1'
     }
 
+## Sample
+[Sample 下载](https://github.com/pedant/safe-java-js-webview-bridge/releases/download/v1.1/safe-webview-bridge-sample-v1.1.apk)
+
+![image](https://github.com/pedant/safe-java-js-webview-bridge/raw/master/app-sample-screenshot.png)
 
 ## 用法
 
@@ -143,9 +147,6 @@ JS中使用过大数字时，可能会导致精度丢失或者错误的数字结
 
 	HostApp.passLongType(14102300951321235+'')。	
 
-## Demo运行示意图
-![image](https://github.com/pedant/safe-java-js-webview-bridge/raw/master/app-sample-screenshot.png)
-
 更多实现细节见: http://www.pedant.cn/2014/07/04/webview-js-java-interface-research/
 
 ## License