Fixing build

Author: darkl

src/net45/WampSharp/WAMP2/V2/Transports/InMemory/InMemoryConnectionListener.cs

@@ -74,7 +74,8 @@ public InMemoryConnection(IWampBinding<TMessage> binding, IObservable<WampMessag
                 mBinding = binding;
 
                 IDisposable connectionClosedSubscription =
-                    mConnectionClosed.Subscribe(x => RaiseConnectionClosed());
+                    mConnectionClosed.Take(1)
+                                     .Subscribe(x => RaiseConnectionClosed());
 
                 IDisposable connectionOpenSubscription =
                     mConnectionOpen.Subscribe(x => RaiseConnectionOpen());