Update README.md

README.md

@@ -18,4 +18,6 @@ source <(curl -L https://go-install.netlify.app/install.sh) -v 1.13.5
 默认更新策略是已有版本和最新版本一样就不去更新, 要强制更新添加-f
 ```
 source <(curl -L https://go-install.netlify.app/install.sh) -f
-```
+```
+
+脚本会自动安装`goupdate`全局命令, 命令和上面的`source <(curl -L https://go-install.netlify.app/install.sh)`命令等价, 后面可以直接运行`goupdate`命令来更新即可