symfony/symfony-docs — pull request #3282 by bartekn (2013-12-04 17:43:38+00:00)
Title: Updated required PHPUnit version

Running tests on version 3.6.4 ends with following error:
```
PHP Fatal error: Call to undefined method Symfony\Component\Form\Tests\SimpleFormTest::callback() in symfony/src/Symfony/Component/Form/Tests/SimpleFormTest.php on line 107
```