config.sh: do not grep README for deps' URLs
config.sh: do not grep README for deps' URLs

I didn't notice that I broke this clever hack when I changed the format
of the README to Markdown. Don't feel like it's too important, so won't
fix it.

newsboat/newsboat,der-lyse/newsboat,der-lyse/newsboat,newsboat/newsboat,newsboat/newsboat,der-lyse/newsboat,der-lyse/newsboat,newsboat/newsboat,der-lyse/newsboat,der-lyse/newsboat,der-lyse/newsboat,der-lyse/newsboat,newsboat/newsboat,newsboat/newsboat,newsboat/newsboat,newsboat/newsboat