Diot

- 🐛 Don't fallback to Diot if value type is a subclass of it when nesting

**Full Changelog**: https://github.com/pwwang/diot/compare/0.1.7...0.1.8

- ✏️ Fix a typo in ImportError message
- ⬆️ Update rtoml to v0.8 in dev-deps
- 🐛 Fix pop for OrderedDiot
- 📝 Fix badges in README

**Full Changelog**: https://github.com/pwwang/diot/compare/0.1.6...0.1.7

- Pin dep and doc dep versions
- Require python3.7+
- Use rtoml for tests (ref: https://github.com/pwwang/toml-bench)
- Add python3.10 in CI

- Fall back to list when trying to keep the subclass

- ✨ Add key missing handler (3)

- 🐛Fix transformable keys not added