update download link

Author: phobal

README.md

@@ -7,8 +7,8 @@
 #### 使用方法
 
 1. 下载客户端 
-* [Mac](https://github.com/phobal/ivideo/releases/download/1.1.1/ivideo-1.1.1-mac.zip)
-* [Windows](https://github.com/phobal/ivideo/releases/download/1.1.1/ivideo-1.1.1-win.zip)
+* [Mac](https://github.com/phobal/ivideo/releases/download/v1.1.2/ivideo-1.1.2-mac.zip)
+* [Windows](https://github.com/phobal/ivideo/releases/download/v1.1.2/ivideo-1.1.2-win.zip)
 * [Linux](https://github.com/phobal/ivideo/releases/download/1.0.0/linux-unpacked.v1.0.0.zip)
 
 2. 选择视频资源