Added MG_WS_CONNECT

mongoose.h

@@ -68,6 +68,7 @@ enum mg_event {
   MG_REPLY,       // If callback returns MG_FALSE, Mongoose closes connection
   MG_CLOSE,       // Connection is closed, callback return value is ignored
   MG_WS_HANDSHAKE,  // New websocket connection, handshake request
+  MG_WS_CONNECT,  // New websocket connection established
   MG_HTTP_ERROR   // If callback returns MG_FALSE, Mongoose continues with err
 };
 typedef int (*mg_handler_t)(struct mg_connection *, enum mg_event);