fix code style

Author: Gianluca

src/Illuminate/Database/Eloquent/Model.php

@@ -440,11 +440,11 @@ public function qualifyColumn($column)
      * @param  array|mixed  $columns
      * @return array
      */
-    public function qualifyColumns($columns) 
+    public function qualifyColumns($columns)
     {
         $columns = is_array($columns) ? $columns : func_get_args();
         $qualifiedArray = [];
-        foreach($columns as $column) {
+        foreach ($columns as $column) {
             $qualifiedArray[] = $this->qualifyColumn($column);
         }
         return $qualifiedArray;