fixing use strict issue

Author: Igor Escobar

.jshintrc

@@ -27,7 +27,7 @@
   "quotmark": "single",
   "regexp": true,
   "smarttabs": true,
-  "strict": true,
+  "strict": false,
   "trailing": true,
   "undef": true,
   "unused": true

src/jquery.mask.js

@@ -35,8 +35,6 @@
 /* jshint maxcomplexity:17 */
 /* global define */
 
-'use strict';
-
 // UMD (Universal Module Definition) patterns for JavaScript modules that work everywhere.
 // https://github.com/umdjs/umd/blob/master/templates/jqueryPlugin.js
 (function (factory, jQuery, Zepto) {
@@ -50,6 +48,7 @@
     }
 
 }(function ($) {
+    'use strict';
 
     var Mask = function (el, mask, options) {