Fix modern syntax

Author: battye

tests/FileListValidator/FileListTest.php

@@ -15,7 +15,7 @@ class FileListTest extends \Phpbb\TranslationValidator\Tests\TestBase
 	/** @var \Phpbb\TranslationValidator\Validator\FileListValidator */
 	protected $validator;
 
-	public function setUp()
+	public function setUp(): void
 	{
 		parent::setUp();
 

tests/FileValidator/TestBase.php

@@ -13,7 +13,7 @@ class TestBase extends \Phpbb\TranslationValidator\Tests\TestBase
 	/** @var \Phpbb\TranslationValidator\Validator\FileValidator */
 	protected $validator;
 
-	public function setUp()
+	public function setUp(): void
 	{
 		parent::setUp();
 

tests/LangKeyValidator/TestBase.php

@@ -13,7 +13,7 @@ class TestBase extends \Phpbb\TranslationValidator\Tests\TestBase
 	/** @var \Phpbb\TranslationValidator\Validator\LangKeyValidator */
 	protected $validator;
 
-	public function setUp()
+	public function setUp(): void
 	{
 		parent::setUp();
 

tests/TestBase.php

@@ -8,12 +8,12 @@
  */
 namespace Phpbb\TranslationValidator\Tests;
 
-class TestBase extends \PHPUnit_Framework_TestCase
+class TestBase extends \PHPUnit\Framework\TestCase
 {
 	/** @var \Phpbb\TranslationValidator\Output\Output */
 	protected $output;
 
-	public function setUp()
+	public function setUp(): void
 	{
 		parent::setUp();