Merge pull request #11 from KeyouXZ/dev

fix(rank): Fix regression where rank changes required re-login

fix(rank): Fix regression where rank changes required re-login

feat(skynomi): introduce leaderboard command

feat(rank): add item restriction support in rank system

- Bump version from v1.1.3 to v1.2.0
- Added support for restricting items per rank via "Restricted Items" config

docs: update

chore: typo

fix(core): properly track and remove deleted entries from cache

docs: Change license from MIT to GPL v3

docs: add guide for v2.0.0 update

- Documented new `Announce Rank Up` and `Enable Rank Down` configs
- Added usage details for `rankutils info` & `rankutils list` commands