Fix commas with multiple pages

go/unpaginate/unpaginate.go

	os.Stdout.WriteString("[\n")
	first := true
	for url != "" {
		res, err := http.Get(url)
		if err != nil {
			os.Exit(1)
		}
		first := true
		for decoder.More() {
			if !first {
				os.Stdout.WriteString(", ")