1.17之后，不应该用go get下载安装命令,gin框架安装失败

'go get' is no longer supported outside a module.

PS E:\goproject\src\demo1> go get -u github.com/gin-gonic/gin
go: go.mod file not found in current directory or any parent directory.
        'go get' is no longer supported outside a module.
        To build and install a command, use 'go install' with a version,
        like 'go install example.com/cmd@latest'
        For more information, see https://golang.org/doc/go-get-install-deprecation
        or run 'go help get' or 'go help install'.

1.17之后，不应该用go get下载安装命令（即可执行程序），如果使用goget安装命令，就会提示上述警告，

也就是说go get只能下载普通的包，如果下载安装程序需要用go install

PS E:\goproject\src\demo1> go install github.com/gin-gonic/gin@latest

完美解决gin包安装失败的问题！

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