Fenced code blocks attributes in curly braces break highlighting

Thanks for this package. This issue is similar to #123. I usually add fenced code blocks attributes in curly braces, as in {.bib}. This breaks highlighting in language-markdown (gfm works fine):

Removing the curly braces fixes the issue:

I don’t insist on using curly braces, it’s just that I used to do it this way and I have a lot of older documents which I would have to readjust when I want to keep using language-markdown. Would be glad if this could be fixed.

[sbaack]

Thanks for the quick reply. This problem persists when I switch to {.js}.

[sbaack]

You’re right, {js } or {.bib } works. Thanks for your work!