Remove event handler for NetworkChange.NetworkAddressChanged

fixes #99

Author: schotime

src/MulticastService.cs

@@ -267,6 +267,7 @@ public void Stop()
             QueryReceived = null;
             AnswerReceived = null;
             NetworkInterfaceDiscovered = null;
+            NetworkChange.NetworkAddressChanged -= OnNetworkAddressChanged;
 
             // Stop current UDP listener
             client?.Dispose();