I've taken a look at that dependency. The lego 3.0.2 release depends on that particular commit of the goh repo. That goh commit exists only on the Go module proxy now. Setting GOPROXY="https://proxy.golang.org" fixes the build issues for version 0.7.2 of certmagic.

With Go 1.12 and master:

/github.com/mholt/certmagic/client.go:143:8: ht.ForceAttemptHTTP2 undefined (type *http.Transport has no field or method ForceAttemptHTTP2)

With certmagic 0.7.2 and Go 1.12:

go: github.com/labbsr0x/[email protected]: unknown revision 8b16b4848295

What would you like to have changed?

The older versions don't work any more due to some dependencies being force pushed. The latest version doesn't work with Go 1.12.x. Projects which depend on certmagic can't be built with Go 1.12.

Why is this feature a useful, necessary, and/or important addition to this project?

Builds should still work with the old stable Go version.