fix: undefined variable typo

Author: asanchezdelc

lib/mqtt.js

@@ -34,8 +34,8 @@ Cayenne.prototype.__proto__ = events.EventEmitter.prototype;
 Cayenne.prototype.connect = function(callback) {
   const self = this;
   thingTopic = this.rootTopic;
-  
-  this.client = mqtt.connect("mqtt://" + broker, {
+
+  this.client = mqtt.connect("mqtt://" + this.broker, {
       username: this.options.username,
       password: this.options.password,
       clientId: this.options.clientId,

package.json

@@ -1,7 +1,7 @@
 {
   "name": "cayennejs",
   "description": "Cayenne API Node.JS Library",
-  "version": "0.0.1",
+  "version": "0.0.2",
   "homepage": "mydevices.com/cayenne",
   "repository": "https://github.com/myDevicesIoT/cayennejs",
   "main": "",