Added
- Testing supported by `unittest`, `asynctest` and `pytest`.
- New parameter `offset` of `SQLizer.select_custom_fields`. [Here](https://github.com/NightMarcher/fastapi-efficient-sql/commit/698539f332823e1402fbf7c219f506614b94e685)
Improved
- Check `model` of managers and table of `model.Meta` first. [Here](https://github.com/NightMarcher/fastapi-efficient-sql/commit/13fc7fd32fc261437b80a13a6e47f73588183d38)
- Decorator `timing` supports both sync and async functions. [Here](https://github.com/NightMarcher/fastapi-efficient-sql/commit/316f8a3646de74f421a24cd8eb4a721400e3430f)