Bump php-webdriver/webdriver from 1.7.1 to 1.8.0

Bumps [php-webdriver/webdriver](https://github.com/php-webdriver/php-webdriver) from 1.7.1 to 1.8.0.
- [Release notes](https://github.com/php-webdriver/php-webdriver/releases)
- [Changelog](https://github.com/php-webdriver/php-webdriver/blob/master/CHANGELOG.md)
- [Commits](https://github.com/php-webdriver/php-webdriver/compare/1.7.1...1.8.0

)

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