fixed typo

Author: fabpot

src/Symfony/Component/Translation/Tests/TranslatorTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\Translation\Tests;
 
 use Symfony\Component\Translation\Translator;
+use Symfony\Component\Translation\MessageSelector;
 use Symfony\Component\Translation\Loader\ArrayLoader;
 
 class TranslatorTest extends \PHPUnit_Framework_TestCase