I'll take a look at it. Tim Pope also has an independent plugin also called vim-markdown, I don't remember what the differences were between your upstream and his.
Looks like (vim legend) Tim Pope’s is the Markdown support included with Vim. My fork is of plasticboy’s, which adds a few features, like the TOC generation, to the default. So far my fork just adds one option that I needed, to only recognize Atx headers.
I'll take a look at it. Tim Pope also has an independent plugin also called vim-markdown, I don't remember what the differences were between your upstream and his.