Update cmark to https://github.com/github/cmark/commit/57b35673b74ea692e37e2930f05e5afdbbedd05e
Update cmark to https://github.com/github/cmark/commit/57b35673b74ea692e37e2930f05e5afdbbedd05e

gjtorikian/commonmarker,gjtorikian/commonmarker,gjtorikian/commonmarker