Dependency package not found

[alexthemonk]

Hi,
Thank you for this amazing project.
I was trying to get the package using go get github.com/rhysd/go-github-selfupdate
And I encountered this error message:

package github.com/google/go-github/v30/github: cannot find package "github.com/google/go-github/v30/github" in any of:
        /.../src/github.com/google/go-github/v30/github (from $GOROOT)
        /.../src/github.com/google/go-github/v30/github (from $GOPATH)

Could you please help me with this issue?
Thank you very much.