fix date_formatted issue

lib/pico.php

@@ -1,5 +1,4 @@
 <?php
-use \ParsedownExtra;
 
 /**
  * Pico
@@ -192,7 +191,7 @@ class Pico {
 			'site_title' => 'Pico',
 			'base_url' => $this->base_url(),
 			'theme' => 'default',
-			'date_format' => 'jS M Y',
+			'date_format' => '%D %T',
 			'twig_config' => array('cache' => false, 'autoescape' => false, 'debug' => false),
 			'pages_order_by' => 'alpha',
 			'pages_order' => 'asc',