message: Add change log entry for sk locale [skip ci]
diff: @@ -148,6 +148,8 @@ for the list of changes made since `v2.0.0-alpha.1`.
  - [zh-TW locale was updated for v2](https://github.com/date-fns/date-fns/pull/1101). Credits go to [@jackhsu978](https://github.com/jackhsu978)!
  +- [sk locale was updated for v2](https://github.com/date-fns/date-fns/pull/1090). Thank you, [@mareksuscak](https://github.com/mareksuscak)!
  +
  - New locale-dependent week-numbering year helpers:
  - `getWeek`
  