php8 support

tests/Internal/ZipFileExtended.php

@@ -1,15 +1,21 @@
 <?php
 
+declare(strict_types=1);
+
+/*
+ * This file is part of the nelexa/zip package.
+ * (c) Ne-Lexa <https://github.com/Ne-Lexa/php-zip>
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace PhpZip\Tests\Internal;
 
 use PhpZip\ZipFile;
 
-/**
- * Class ZipFileExtended.
- */
 class ZipFileExtended extends ZipFile
 {
-    protected function onBeforeSave()
+    protected function onBeforeSave(): void
     {
         parent::onBeforeSave();
         $this->deleteFromRegex('~^META\-INF/~i');