Added sctrict types

Author: damianopetrungaro

src/Container.php

@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Moon\Container;
 
 use Moon\Container\Exception\NotFoundException;

src/Exception/NotFoundException.php

@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Moon\Container\Exception;
 
 use Psr\Container\NotFoundExceptionInterface;