tsutsui
80a7294d7a
ruby-rainbow: update to 3.0.0.
Upstream changes (from Changelog.md):
## 3.0.0 (2017-11-29)
* added String refinement
* added new `Rainbow.uncolor` method
* dropped MRI 1.9.3 compatibility
* dropped MRI 2.0 compatibility
* removed Rake dependency