php8 support

tests/Internal/Epub/EpubZipContainer.php

@@ -1,21 +1,25 @@
 <?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\Epub;
 
 use PhpZip\Exception\ZipEntryNotFoundException;
 use PhpZip\Model\ZipContainer;
 
-/**
- * Class EpubZipContainer.
- */
 class EpubZipContainer extends ZipContainer
 {
     /**
      * @throws ZipEntryNotFoundException
-     *
-     * @return string
      */
-    public function getMimeType()
+    public function getMimeType(): string
     {
         return $this->getEntry('mimetype')->getData()->getDataAsString();
     }