What's Changed
* Add type information for `DbClosedError` by GodTamIt in https://github.com/Congyuwang/RocksDict/pull/97
* Cancel all background work on last reference drop by GodTamIt in https://github.com/Congyuwang/RocksDict/pull/98
* Update rocksdb to v8.8.1 by Congyuwang in https://github.com/Congyuwang/RocksDict/pull/99
**Full Changelog**: https://github.com/Congyuwang/RocksDict/compare/v0.3.18...v0.3.19