[fix] onPacket now emits data on 'closing' state as well (#484)

Author: besaplla

lib/socket.js

@@ -415,7 +415,8 @@ Socket.prototype.onOpen = function () {
  */
 
 Socket.prototype.onPacket = function (packet) {
-  if ('opening' === this.readyState || 'open' === this.readyState) {
+  if ('opening' === this.readyState || 'open' === this.readyState ||
+      'closing' === this.readyState) {
     debug('socket receive: type "%s", data "%s"', packet.type, packet.data);
 
     this.emit('packet', packet);