Fix Reach services discovery

- Use github.com/grandcat/zeroconf lib instead of github.com/oleksandr/bonjour

example/discovery/main.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"log"
+	"time"
+
+	"forge.cadoles.com/Pyxis/orion/emlid"
+)
+
+var (
+	timeout = 5 * time.Second
+)
+
+func init() {
+	flag.DurationVar(&timeout, "timeout", timeout, "mDNS scan timeout")
+}
+
+func main() {
+
+	flag.Parse()
+
+	log.Println("Searching for ReachRS services on network...")
+
+	ctx, cancel := context.WithTimeout(context.Background(), timeout)
+	defer cancel()
+
+	services, err := emlid.Discover(ctx)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	for _, s := range services {
+		log.Println("Found:")
+		log.Printf("  Name: '%s'", s.Name)
+		log.Printf("  Hosts: %s", s.AddrV4)
+		log.Printf("  Port: '%d'", s.Port)
+	}
+
+}