Can't install Go package

[Guslington]

The command in the readme to install the Go package fails with the error:

 >> go get cdk-stacksets-go
go: malformed module path "cdk-stacksets-go": missing dot in first path element

Go mod tidy produces

 >> go mod tidy
go: finding module for package github.com/cdklabs/cdk-stacksets
go: teststack imports
        github.com/cdklabs/cdk-stacksets: module github.com/cdklabs/cdk-stacksets@latest found (v0.0.150), but does not contain package github.com/cdklabs/cdk-stacksets

I can't seem to find the package in https://pkg.go.dev either.

Is there a go build for this construct?