The https://golang.org/project/ page has a "Version history" section that lists major Go releases that have been released. Prior to CL 229483, it needed to be manually updated before each final major release, and so to catch potential mistakes releasebot has a safety check that aborts the release process if the major version isn't listed:

func (w *Work) checkDocs() {
	// Check that the major version is listed on the project page.
	data, err := ioutil.ReadFile(filepath.Join(w.Dir, "gitwork", "doc/contrib.html"))
	if err != nil {
		w.log.Panic(err)
	}
	major := major(w.Version)
	if !strings.Contains(string(data), major) {
		w.logError("doc/contrib.html does not list major version %s", major)
	}
}

(Source: golang.org/x/build/cmd/releasebot/main.go#L595-L605.)

The doc/contrib.html file no longer needs to be manually updated, and it doesn't even exist in the main repo as it was moved to x/website in CL 229485. The check needs to be removed.

/cc @toothrot @cagedmantis @andybons