Make the usage message prettier

go/unpaginate/unpaginate.go

	"strings"
)
func init() {
	flag.Usage = func() {
		fmt.Fprintf(os.Stderr, "Usage: %s [flags] <url>\n\n", os.Args[0])
		fmt.Fprintf(os.Stderr, `Fetches JSON documents from a paginated resource
and returns a single JSON document.
`)
		flag.PrintDefaults()
		fmt.Fprintf(os.Stderr, "  -h, --help\n\tDisplay this message\n")
	}
}
func main() {
	flag.Parse()
	if flag.NArg() != 1 {
		fmt.Printf("Usage: %s [flags] <url>\n", os.Args[0])
		flag.PrintDefaults()
		flag.Usage()
		os.Exit(1)
	}