[fix] minor typo

Author: yawnt

lib/http-proxy/index.js

@@ -90,6 +90,8 @@ function createRightProxy(type) {
 
 
 function ProxyServer(options, web, ws) {
+  EE3.call(this);
+
   this.web     = web;
   this.ws      = ws;
   this.options = options;