Update README.md

Author: StephenHodgson

README.md

@@ -437,7 +437,7 @@ var tools = new List<Tool>
 };
 var options = new Options(Model.GPT4oRealtime, tools: tools);
 using var session = await api.RealtimeEndpoint.CreateSessionAsync(options);
-var responseTask = await session.ReceiveUpdatesAsync<IServerEvent>(ServerEvents, cancellationTokenSource.Token);
+var responseTask = session.ReceiveUpdatesAsync<IServerEvent>(ServerEvents, cancellationTokenSource.Token);
 await session.SendAsync(new ConversationItemCreateRequest("Hello!"));
 await session.SendAsync(new CreateResponseRequest());
 await session.SendAsync(new InputAudioBufferAppendRequest(new ReadOnlyMemory<byte>(new byte[1024 * 4])), cancellationTokenSource.Token);