[FR]: support lowercase keywords

[j-lakeman]

Would be awesome if #todo //bug etc. could also be matched.

Awesome extension! Keep up the good work!

[thedadams]

Thanks for the request, but, for now, I won't be adding lowercase. The way the grammar works would make it difficult.

I could see a future where, when Zed allows extensions to have settings, users can specify their own tag names. I don't know how far away that is in Zed, though.