fixing jshint issues

bin/templates/cordova/lib/AndroidStudio.js

@@ -4,12 +4,15 @@
  *  @param {String} root Root folder of the project
  */
 
+/*jshint esversion: 6 */
+
 var path = require('path');
 var fs = require('fs');
 
 function isAndroidStudioProject(root) {
     var eclipseFiles = ['AndroidManifest.xml', 'libs', 'res', 'project.properties', 'platform_www'];
     var androidStudioFiles = ['app', 'gradle', 'build', 'app/src/main/assets'];
+    var file;
     for(file of eclipseFiles) {
       if(fs.existsSync(path.join(root, file))) {
         return false;