Apply go fix modernizations

poller.go

@@ -94,7 +94,7 @@ func InterfaceBroadcast(iface net.Interface) *net.UDPAddr {
 		}
 
 		bcast := make(net.IP, 4)
-		for i := 0; i < 4; i++ {
+		for i := range 4 {
 			bcast[i] = ip4[i] | ^ipnet.Mask[i]
 		}
 		return &net.UDPAddr{IP: bcast, Port: Port}