Click-extra

- Add support for YAML configuration file. Closes 13.
- Auto-detect configuration file on loading.
- Add `pyyaml` dependency.

- Evaluate format option dynamically at use to let third-party register new
rendering formats.

- Fix creation of post-release version bump PR on tagging.

- Extend `cli-helper.TabularOutputFormatter` with new formats: `simple_grid`,
`rounded_grid`, `double_grid`, `outline`, `simple_outline`, `rounded_outline`
and `double_outline`. Address {issue}`astanin/python-tabulate151`.
- Add a new `--table-format`/`-t` option to select table format rendering mode.
- Add new dependency on `cli-helper` and `tabulate`.
- Automate post-release version bump.

- Fix printing of additional non-grouped default options in help screen.

- Add a `--config`/`-C` option to load CLI configuration from a TOML file.