Default route does not work.

[natschz]

I created a hostrouter like in the readme.

	r := chi.NewRouter()
	r.Get("/test", func(writer http.ResponseWriter, request *http.Request) {
          //...
	})

	hr := hostrouter.New()
	hr.Map("", r) // default

---

But always got 404s. Changed it to wildcard (hr.Map("*", r) ) and it worked. This took my quite some time to figure out, don't know if I'm missing something or not. But after inspecting the hostrouter .ServerHttp function, I suspect that is no "default" at all?

Maybe hr.Map("", apiRouter()) // default should be removed from the readme, or if I'm missing something then maybe update the readme to make it clearer?