Log startup progress

Use our own logger to show where the service is listening for requests.
func main() { log := log.New(os.Stderr, "", log.LstdFlags) - err := http.ListenAndServe(":8080", NewRouter()) + addr := ":8080" + log.Print("Listening on ", addr) + err := http.ListenAndServe(addr, NewRouter()) if err != nil { log.Print(err) os.Exit(1)
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