cli: improve -version handling

[kamilsk]

Motivation: it contains fake value goimports -version stub, because I used

go-tools/cmd/goimports/mod.go

Lines 27 to 30 in 52a710f

	flag.Func("version", "show tool version", func(string) error {
	_, _ = fmt.Printf(message, version, date, commit)
	return nil
	})

[kamilsk]

fixed, v0.12.0