module found but does not contain package

I'm following the instructions on the README. However, when I try to do:
```
go install github.com/cucumber/godog/cmd/godog@latest
```
I get:
`go: github.com/cucumber/godog/cmd/godog@latest: module github.com/cucumber/godog@latest found (v0.12.5), but does not contain package github.com/cucumber/godog/cmd/godog`

Note that I did have v0.12.4 installed before.
Anyway, I get no errors if I do:
`go install github.com/cucumber/godog/cmd/godog@v0.12.4` or
`go install github.com/cucumber/godog/cmd/godog@v0.12.3`
but I do if I try to reference either `latest` or `v0.12.5`

I had also tried running `go clean -modcache` based on finding that suggestion online for this error in general, but that did not help.

(Note, I am outside of my $GOPATH.)