feat: Поддержка psr4. Кеширование шаблона

examples/example4.php

@@ -1,12 +1,13 @@
 <?php
 
 require_once '../Klein.php';
+use ctiso\Klein;
 
 function title($x) {
     return ucfirst($x);
 }
 
-$tpl = new Klein('template.html');
+$tpl = new Klein(__DIR__ . '/cache');
 
 $u1 = new stdClass();
 $u1->name = 'Paul';
@@ -20,7 +21,7 @@ $u3 = new stdClass();
 $u3->name = 'Jane';
 $u3->age = 12;
 
-echo $tpl->render([
+echo $tpl->render('template.html', [
     'pagename' => 'awesome people',
     'authors' => [$u1, $u2, $u3],
     'city'=> [