Changing to file level use strict statement

lib/helpers/transformData.js

@@ -1,3 +1,5 @@
+'use strict';
+
 var utils = require('./../utils');
 
 /**
@@ -9,7 +11,6 @@ var utils = require('./../utils');
  * @returns {*} The resulting transformed data
  */
 module.exports = function transformData(data, headers, fns) {
-  'use strict';
   utils.forEach(fns, function (fn) {
     data = fn(data, headers);
   });