[fix] Remove parsejson dependency (#580)

Related: https://nodesecurity.io/advisories/528.

Author: Matt Grande

lib/socket.js

@@ -8,7 +8,6 @@ var debug = require('debug')('engine.io-client:socket');
 var index = require('indexof');
 var parser = require('engine.io-parser');
 var parseuri = require('parseuri');
-var parsejson = require('parsejson');
 var parseqs = require('parseqs');
 
 /**
@@ -439,7 +438,7 @@ Socket.prototype.onPacket = function (packet) {
 
     switch (packet.type) {
       case 'open':
-        this.onHandshake(parsejson(packet.data));
+        this.onHandshake(JSON.parse(packet.data));
         break;
 
       case 'pong':

package.json

@@ -29,7 +29,6 @@
     "engine.io-parser": "~2.1.1",
     "has-cors": "1.1.0",
     "indexof": "0.0.1",
-    "parsejson": "0.0.3",
     "parseqs": "0.0.5",
     "parseuri": "0.0.5",
     "ws": "~2.3.1",