Fix typo when calling parseDocBlock method

Hi! I'm using your library and after a composer update it seems that you missed a typo calling the parseDocBlock method.

This is the php error after the update:

```
PHP Notice:  Undefined variable: self in /home/vagrant/Core/externals/php-vcr/phpunit-testlistener-vcr/PHPUnit/Util/Log/VCR.php on line 122
PHP Stack trace:
PHP   1. {main}() /usr/bin/phpunit:0
PHP   2. PHPUnit_TextUI_Command::main() /usr/bin/phpunit:46
PHP   3. PHPUnit_TextUI_Command->run() /usr/share/php/PHPUnit/TextUI/Command.php:129
PHP   4. PHPUnit_TextUI_TestRunner->doRun() /usr/share/php/PHPUnit/TextUI/Command.php:176
PHP   5. PHPUnit_Framework_TestSuite->run() /home/vagrant/Core/externals/phpunit/phpunit/src/TextUI/TestRunner.php:423
PHP   6. PHPUnit_Framework_TestSuite->run() /home/vagrant/Core/externals/phpunit/phpunit/src/Framework/TestSuite.php:751
PHP   7. PHPUnit_Framework_TestSuite->run() /home/vagrant/Core/externals/phpunit/phpunit/src/Framework/TestSuite.php:751
PHP   8. PHPUnit_Framework_TestCase->run() /home/vagrant/Core/externals/phpunit/phpunit/src/Framework/TestSuite.php:751
PHP   9. PHPUnit_Framework_TestResult->run() /home/vagrant/Core/externals/phpunit/phpunit/src/Framework/TestCase.php:711
PHP  10. PHPUnit_Framework_TestResult->startTest() /home/vagrant/Core/externals/phpunit/phpunit/src/Framework/TestResult.php:581
PHP  11. PHPUnit_Util_Log_VCR->startTest() /home/vagrant/Core/externals/phpunit/phpunit/src/Framework/TestResult.php:365
```

pd: sorry for my english :)