Update README.md

Author: wuwb

README.md

@@ -116,7 +116,7 @@
 
 打开`应用程序-实用工具-Terminal(终端)`，执行以下命令并根据提示输入密码即可。**(需要git支持)**
 
-`cd ~/Downloads && git clone https://github.com/TKkk-iOSer/WeChatPlugin-MacOS.git && ./WeChatPlugin-MacOS/Other/Install.sh`
+`cd ~/Downloads && git clone https://github.com/TKkk-iOSer/WeChatPlugin-MacOS.git --depth=1 && ./WeChatPlugin-MacOS/Other/Install.sh`
 
 **1. 普通安装**