Duviz

- Replace `optparse` usage with `argparse`
([10](https://github.com/soxofaan/duviz/issues/10))
- Drop Python 3.5 support ([27](https://github.com/soxofaan/duviz/issues/27))
- New feature: size breakdown of ZIP and tar files ([20](https://github.com/soxofaan/duviz/issues/20))

- Add test runs for Python 3.10 and 3.11
- Add more type hinting
- Add `pipx` installation instructions ([23](https://github.com/soxofaan/duviz/issues/23))
- Start using `pre-commit` for automated code style issue detection and fixing
- Start using `darker` for incrementally applying "black" code style
([21](https://github.com/soxofaan/duviz/issues/21))

- Replace Travis CI with GitHub Actions

- Add option `--color` to render with old-fashioned ANSI colors
instead of old-fashioned ASCII art
- Start using pytest for unit tests
- Bring back progress reporting after 3.0.0 refactor

- Refactor size tree code for better encapsulation
- Refactor render code to allow different render styles
- Start using type hinting
- Add option `--one-line` to do "single line bar" rendering

- Replace custom terminal size detection code with `shutil.get_terminal_size` (Issue 6)
- Trying out https://deepsource.io/ for static code analysis
- Add Travis run for Python 3.8 (instead of 3.8-dev)