[chore] Release 3.4.0

The build failure is due to some ES6 usage in the debug dependency, which will have to be fixed
in the future (by using Babel for example).

Diff: 3.3.0...3.4.0

package.json

@@ -1,6 +1,6 @@
 {
   "name": "socket.io-parser",
-  "version": "3.3.0",
+  "version": "3.4.0",
   "description": "socket.io protocol parser",
   "repository": {
     "type": "git",