Single types beginning with a number incorrectly flagged as not adhering to kebab case

[martinsilha]

I don't have the exact error in front of me at the moment as I have already worked through it...

But when my single type 30-day-dental-health-challenge was renamed to dental-health-challenge it was deemed as valid kebab-case. I had to rename the singularName property and the directory it was in in order to be deemed valid