Bump phpunit/phpunit from 6.5.5 to 6.5.6
Bump phpunit/phpunit from 6.5.5 to 6.5.6

Bumps [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) from 6.5.5 to 6.5.6.
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/master/ChangeLog-5.7.md)
- [Commits](https://github.com/sebastianbergmann/phpunit/compare/6.5.5...6.5.6)
alcohol/paste.robbast.nl,alcohol/paste.robbast.nl,alcohol/sf-minimal-demo,alcohol/paste.robbast.nl