Bump capybara from 2.15.1 to 2.15.2
Bump capybara from 2.15.1 to 2.15.2

Bumps [capybara](https://github.com/teamcapybara/capybara) from 2.15.1 to 2.15.2.
- [Changelog](https://github.com/teamcapybara/capybara/blob/master/History.md)
- [Commits](https://github.com/teamcapybara/capybara/compare/2.15.1...2.15.2)
ministryofjustice/prison-visits-public,ministryofjustice/prison-visits-public,ministryofjustice/prison-visits-public,ministryofjustice/prison-visits-public