Fixes #43: html.nanorc yellow regex is greedy and matches all quotes until the final quote.

Since the non-greedy operator `?` causes an error, I've implemented non-greedy matching using not-quote zero or more times (`[^"]*`) instead.
Merge pull request #44 from stiemannkj1/master

Fixes #43: html.nanorc yellow regex is greedy and matches all quotes until the final quote.