Add possibility to define options in toml-file

[AIexanderDicke]

To use pip-licenses for automated license checks it would be helpful to add a feature that allows to load the configuration from a toml-file. However, this would require another dependency, e.g. tomlkit.

[isaac-hazy]

Config file support would be really helpful, anything would be better than nothing, but perhaps pyproject.toml support would be best.