Bump lib/variant from `d2588a8` to `cb02ad4` (#57)
Bump lib/variant from `d2588a8` to `cb02ad4` (#57)

Bumps [lib/variant](https://github.com/mapbox/variant) from `d2588a8` to `cb02ad4`.
- [Release notes](https://github.com/mapbox/variant/releases)
- [Commits](https://github.com/mapbox/variant/compare/d2588a8f1d6b5d480d228e6d8a906ce634bdea9a...cb02ad487e069e050e5db11b1e5e9ccbe269e2fa)
tn0502/rainbow,tn0502/rainbow,tn0502/rainbow,tn0502/rainbow,tn0502/rainbow,tn0502/rainbow