Mention __untagged__ in the README.md

[souliane]

Thanks for this, it's useful!

Maybe you would like to add in the documentation that the config file can use __untagged__ to allocate time without any tag.

Cheers,
Adrien

[guludo]

Hi @souliane!

I'm glad this it useful to you! 🙂

There is a mention in the README, in the bullet point that talks about <tag> (at the end of the introduction of https://github.com/guludo/timewarrior-balance#configuration-file),