Bump behat/behat from 3.14.0 to 3.15.0 (#472)

Bumps [behat/behat](https://github.com/Behat/Behat) from 3.14.0 to 3.15.0.
- [Release notes](https://github.com/Behat/Behat/releases)
- [Changelog](https://github.com/Behat/Behat/blob/master/CHANGELOG.md)
- [Commits](Behat/Behat@v3.14.0...v3.15.0)

---
updated-dependencies:
- dependency-name: behat/behat
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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