Fix use ordering.

tests/TestCase/Http/ResponseEmitterTest.php

@@ -18,8 +18,8 @@ use Cake\Http\CallbackStream;
 use Cake\Http\ResponseEmitter;
 use Cake\TestSuite\TestCase;
 use Zend\Diactoros\Response;
-use Zend\Diactoros\Stream;
 use Zend\Diactoros\ServerRequestFactory;
+use Zend\Diactoros\Stream;
 
 require_once __DIR__ . '/server_mocks.php';