Diot

- fix: update type hints for better type checking and add py.typed for type support

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

- chore(deps): drop python3.7 and python3.8; upgrade rtoml to 0.12
- ci: update ci for latest actions
- style: increase max line length to 88 and update type assertions in tests

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

- 🐛 Fix deepcopy not copying metadata in `__diot__`

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

- ⚡️ Don't stack for some expections to make them neater
- 🚑 Ignore Nones in args for Diot construct

**Full Changelog**: https://github.com/pwwang/diot/compare/0.2.1...0.2.2

- 🚑 Fix update_recursively not upgrading the 2nd layer and on

**Full Changelog**: https://github.com/pwwang/diot/compare/0.2.0...0.2.1

- 💥 Don't update recursively for `.update()`, use `.update_recursively()` to do so

**Full Changelog**: https://github.com/pwwang/diot/compare/0.1.8...0.2.0