Bump loofah from 2.1.1 to 2.2.0
Bump loofah from 2.1.1 to 2.2.0

Bumps [loofah](https://github.com/flavorjones/loofah) from 2.1.1 to 2.2.0.
- [Changelog](https://github.com/flavorjones/loofah/blob/master/CHANGELOG.md)
- [Commits](https://github.com/flavorjones/loofah/compare/v2.1.1...v2.2.0)
alphagov/rummager,alphagov/rummager