Bump simplecov from 0.15.0 to 0.15.1
Bump simplecov from 0.15.0 to 0.15.1

Bumps [simplecov](https://github.com/colszowka/simplecov) from 0.15.0 to 0.15.1.
- [Changelog](https://github.com/colszowka/simplecov/blob/master/CHANGELOG.md)
- [Commits](https://github.com/colszowka/simplecov/compare/v0.15.0...v0.15.1)
ministryofjustice/prison-visits-public,ministryofjustice/prison-visits-public,ministryofjustice/prison-visits-public,ministryofjustice/prison-visits-public