Bump phpunit/phpunit from 7.2.4 to 7.2.6 in /src (#19)
Bump phpunit/phpunit from 7.2.4 to 7.2.6 in /src (#19)

Bumps [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) from 7.2.4 to 7.2.6.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/master/ChangeLog-6.5.md)
- [Commits](https://github.com/sebastianbergmann/phpunit/compare/7.2.4...7.2.6)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
md100play/AudioDidact,md100play/AudioDidact,md100play/AudioDidact