Bump the support libraries version to v28 (#495)
Bump the support libraries version to v28 (#495)

Summary:
Pull Request resolved: https://github.com/facebook/litho/pull/495

This is prerequisite before moving to AndroidX

Reviewed By: passy

Differential Revision: D14124346

fbshipit-source-id: 7690ebb6dac2580f50fdf959ef89b8cf83d24858

facebook/litho,facebook/litho,facebook/litho,facebook/litho,facebook/litho,facebook/litho