Bump govuk_elements_rails from 3.0.2 to 3.1.0 (#983)
Bump govuk_elements_rails from 3.0.2 to 3.1.0 (#983)

Bumps [govuk_elements_rails](https://github.com/alphagov/govuk_elements_rails) from 3.0.2 to 3.1.0.
- [Commits](https://github.com/alphagov/govuk_elements_rails/compare/v3.0.2...v3.1.0)
ministryofjustice/prison-visits-2,ministryofjustice/prison-visits-2,ministryofjustice/prison-visits-2,ministryofjustice/prison-visits-2