Cmdy

- 🐛 Fix quitting functionality in echo.py file.
- ⬆️ Bump python-simpleconf to 0.6

**Full Changelog**: https://github.com/pwwang/cmdy/compare/0.5.4...0.5.5

- 🐛 Fix handling of dunder methods for cmdy attributes

**Full Changelog**: https://github.com/pwwang/cmdy/compare/0.5.3...0.5.4

- Bump varname to 0.11 for python 3.8+

- ⬆️ Pump varname to 0.10

**Full Changelog**: https://github.com/pwwang/cmdy/compare/0.5.1...0.5.2

- Upgrade varname to 0.9

- ♻️ Refactor