bugs/dark-corners-of-unicode.md

I came to the post Dark corners of Unicode

via a comment on lobste.rs

and noticed this typo or misspelling, the unnecessary b

This:

"and the Roman numberal for ten"

should be:

" and the Roman numeral for ten"

I haven't finished reading it yet but it'll be easy enough to submit a report given

https://github.com/eevee/eev.ee/blob/master/content/2015-09-12-dark-corners-of-unicode.markdown