Bump railties from 4.0.2 to 5.2.0
Bump railties from 4.0.2 to 5.2.0

Bumps [railties](https://github.com/rails/rails) from 4.0.2 to 5.2.0.
- [Release notes](https://github.com/rails/rails/releases)
- [Changelog](https://github.com/rails/rails/blob/v5.2.0/railties/CHANGELOG.md)
- [Commits](https://github.com/rails/rails/commits/v5.2.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
mjc/mailcheckjs-rails,mjc/mailcheckjs-rails