Bump behat/mink-selenium2-driver from 1.3.1 to 1.4.0

Bumps [behat/mink-selenium2-driver](https://github.com/minkphp/MinkSelenium2Driver) from 1.3.1 to 1.4.0.
- [Release notes](https://github.com/minkphp/MinkSelenium2Driver/releases)
- [Changelog](https://github.com/minkphp/MinkSelenium2Driver/blob/master/CHANGELOG.md)
- [Commits](minkphp/MinkSelenium2Driver@v1.3.1...v1.4.0)

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