Merge pull request #11 from anhtuank7c/patch-2

Update 20160324054602_Initial.php

Author: lorenzo

config/Migrations/20160324054602_Initial.php

@@ -90,7 +90,7 @@ public function up()
             ->addColumn('modified', 'datetime', [
                 'default' => null,
                 'limit'   => null,
-                'null'    => false,
+                'null'    => true,
             ])
             ->create();
     }