Investigate GH-505 upstream improvements around ATX header parsing
This probably affect our implementation as well.
Upstream issue: https://github.com/gettalong/kramdown/issues/505 Upstream code: https://github.com/gettalong/kramdown/pull/513
This probably affect our implementation as well.
Upstream issue: https://github.com/gettalong/kramdown/issues/505 Upstream code: https://github.com/gettalong/kramdown/pull/513