Simplug

- feat: allow plugins to not exist with `-` for plugins_context

**Full Changelog**: https://github.com/pwwang/simplug/compare/0.4.0...0.4.1

- depr: deprecate `plugins_only_context()` and `plugins_but_context()`, use `plugins_context()` instead
- ci: use latest actions
- style: fix mypy issues

**Full Changelog**: https://github.com/pwwang/simplug/compare/0.3.2...0.4.0

- ⬆️ Bump diot to 0.2.1

**Full Changelog**: https://github.com/pwwang/simplug/compare/0.3.1...0.3.2

- ⬆️ Bump diot to 0.2

**Full Changelog**: https://github.com/pwwang/simplug/compare/0.3.0...0.3.1

- ⬆️ Drop python3.7 support

**Full Changelog**: https://github.com/pwwang/simplug/compare/0.2.3...0.3.0

- ⬆️ Upgrade importlib-metadata to v6
- 👷 Use latest actions in CI

**Full Changelog**: https://github.com/pwwang/simplug/compare/0.2.2...0.2.3