Use PHP7+ strict types

Author: pH-7

src/Parser/DbProductTable.php

@@ -1,10 +1,12 @@
 <?php
 /**
  * @author         Pierre-Henry Soria <[email protected]>
- * @copyright      (c) 2018, Pierre-Henry Soria. All Rights Reserved.
+ * @copyright      (c) 2018-2019, Pierre-Henry Soria. All Rights Reserved.
  * @license        GNU General Public License; <https://www.gnu.org/licenses/gpl-3.0.en.html>
  */
 
+declare(strict_types=1);
+
 namespace Lifyzer\Parser;
 
 use Lifyzer\Parser\DbProductColumns as DbColumn;