Update nikic/php-parser requirement from ^4.3.0 to ^4.4.0
Update nikic/php-parser requirement from ^4.3.0 to ^4.4.0

Updates the requirements on [nikic/php-parser](https://github.com/nikic/PHP-Parser) to permit the latest version.
- [Release notes](https://github.com/nikic/PHP-Parser/releases)
- [Changelog](https://github.com/nikic/PHP-Parser/blob/master/CHANGELOG.md)
- [Commits](https://github.com/nikic/PHP-Parser/compare/v4.3.0...v4.4.0)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
Ocramius/ProxyManager