更新到2.0版本

1. 代码重构+优化
2. 增加所有xml配置项的代码设置方法（mCountdownView.dynamicShow(DynamicConfig dynamicConfig)）
3. 增加代码动态配置的Demo界面
4. fix #8
4. fix #9

Author: iwgang

README.md

@@ -8,7 +8,7 @@
 # CountdownView
 Android Countdown Widget，Use canvas draw，Supports Multiple styles
 
-[Download demo apk](https://raw.githubusercontent.com/iwgang/CountdownView/master/Demo_2.0.apk.apk)
+[Download demo apk](https://raw.githubusercontent.com/iwgang/CountdownView/master/Demo_2.0.apk)
 
 ### Screenshot
 ![](https://raw.githubusercontent.com/iwgang/CountdownView/master/screenshot/g_main.gif)  

README_CN.md

@@ -8,7 +8,7 @@
 # CountdownView
 Android倒计时控件，使用Canvas绘制，支持多种样式
 
-[下载DemoAPK](https://raw.githubusercontent.com/iwgang/CountdownView/master/Demo_2.0.apk.apk)
+[下载DemoAPK](https://raw.githubusercontent.com/iwgang/CountdownView/master/Demo_2.0.apk)
 
 ### Screenshot
 ![](https://raw.githubusercontent.com/iwgang/CountdownView/master/screenshot/g_main.gif)