Bump slim-rails from 3.1.3 to 3.2.0
Bump slim-rails from 3.1.3 to 3.2.0

Bumps [slim-rails](https://github.com/slim-template/slim-rails) from 3.1.3 to 3.2.0.
- [Release notes](https://github.com/slim-template/slim-rails/releases)
- [Changelog](https://github.com/slim-template/slim-rails/blob/master/CHANGELOG.md)
- [Commits](https://github.com/slim-template/slim-rails/compare/v3.1.3...v3.2.0)

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