use os module to get homedir

Author: delabiejochen

lib/api.js

@@ -5,6 +5,7 @@ var fs = require('fs');
 var path = require('path');
 var request = require('request');
 var crypto = require('crypto');
+var os = require('os');
 
 function TestingBot(options) {
   this.options = options || {};
@@ -13,7 +14,7 @@ function TestingBot(options) {
 
   if (!this.options.api_key || !this.options.api_secret) {
     try {
-      var tbFile = path.join(process.env[(process.platform == 'win32') ? 'USERPROFILE' : 'HOME'], '.testingbot');
+      var tbFile = path.join(os.homedir(), '.testingbot');
       if (fs.statSync(tbFile).isFile() === true) {
         var data = fs.readFileSync(tbFile);
         if (data !== null) {