Bump activesupport from 5.1.6 to 5.2.0
Bump activesupport from 5.1.6 to 5.2.0

Bumps [activesupport](https://github.com/rails/rails) from 5.1.6 to 5.2.0.
- [Release notes](https://github.com/rails/rails/releases)
- [Changelog](https://github.com/rails/rails/blob/v5.2.0/activesupport/CHANGELOG.md)
- [Commits](https://github.com/rails/rails/compare/v5.1.6...v5.2.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
nerab/manbook,nerab/manbook