$ go get github.com/alexzorin/authy/cmd/authy-export
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'.
$ go install github.com/alexzorin/authy/cmd/authy-export@latest
go: downloading github.com/alexzorin/authy v0.3.1
go: downloading github.com/alexzorin/authy/cmd/authy-export v0.0.0-20210420073749-0c25c0dd9ab1
go: github.com/alexzorin/authy/cmd/authy-export@latest (in github.com/alexzorin/authy/cmd/authy-export@v0.0.0-20210420073749-0c25c0dd9ab1):
The go.mod file for the module providing named packages contains one or
more replace directives. It must not contain directives that would cause
it to be interpreted differently than if it were the main module.