fix: download binary on mac

Author: rahulnwn

lib/local.js

@@ -1,7 +1,7 @@
 var exec = require('child_process').exec,
     fs = require('fs'),
     http = require('http'),
-    windows = (process.platform.match(/win/) != null),
+    windows = ((process.platform.match(/win32/) || process.platform.match(/win64/)) != null),
     localBinary = __dirname + (windows ? '/BrowserStackTunnel.jar' : '/BrowserStackLocal'),
     utils = require('./utils'),
     config = require('./config');