Update OSCServer.swift

Author: soundflix

Framework/SwiftOSC/Network/OSCServer.swift

@@ -13,7 +13,7 @@ public class OSCServer {
 
     public weak var delegate: OSCDelegate?
 
-    var listener: NWListener?
+    public var listener: NWListener?
     public private(set) var port: NWEndpoint.Port
     public private(set) var name: String?
     var queue: DispatchQueue