Changing to file level use strict statement

lib/helpers/spread.js

@@ -1,3 +1,5 @@
+'use strict';
+
 /**
  * Syntactic sugar for invoking a function and expanding an array for arguments.
  *
@@ -19,7 +21,6 @@
  * @returns {Function}
  */
 module.exports = function spread(callback) {
-  'use strict';
   return function (arr) {
     callback.apply(null, arr);
   };