echo server example is a real echo server, not a broadcast server

examples/echo_server/echo_server.cpp

@@ -46,13 +46,7 @@ int main(int argc, char** argv)
                     }
                     else if (messageType == ix::WebSocket_MessageType_Message)
                     {
-                        for (auto&& client : server.getClients())
-                        {
-                            if (client != webSocket)
-                            {
-                                client->send(str);
-                            }
-                        }
+                        webSocket->send(str);
                     }
                 }
             );