Pipen-args

- ⬆️ Pump pipen to 0.3.8
-🚨 Fix linting for examples
- ⬆️ Bump pardoc to 0.1

**Full Changelog**: https://github.com/pwwang/pipen-args/compare/0.3.2...0.3.3

- 🐛 Fix wrong configs for single-proc pipeline
- ✨ Allow input to be scalar in config file

**Full Changelog**: https://github.com/pwwang/pipen-args/compare/0.3.1...0.3.2

- 📝 Add example for `from pipen_args import config`
- ✨ Support `--cache force` from command line (only when it's not defined in config file)

> NOTE: When we have `[cache]` defined in config file, only the same type of
> value is accepted from the command line argument `--cache`. But cache supports
> `True`, `False` and `"force"`. So when you need `"--cache force"` from command
> line, you have to remove it from the config file if it defaults to a bool.


**Full Changelog**: https://github.com/pwwang/pipen-args/compare/0.3.0...0.3.1

- ✨ Allow config to imported for configurations from file

python
example.py
from pipen_args import config

print(config)


toml
config.toml
a = 1


shell
$ python example.py --config config.toml
Namespace(a=1)



**Full Changelog**: https://github.com/pwwang/pipen-args/compare/0.2.3...0.3.0

- 🧑‍💻 Allow len=1 and len>1 inputs together

**Full Changelog**: https://github.com/pwwang/pipen-args/compare/0.2.2...0.2.3

- 🩹 Use on_init() to initial config instead of on_setup
- ✨ Allow `lang` to be configured