It was the pandoc gfm (github flavored markdown) setting.

I tried the standard markdown (--to markdown) and it didn't render the tables in a readable format on GitHub. Happy to supply it in whatever format people want, it's just an output from the tool and pandoc conversions.

The version I see now is loaded with HTML tags, it is not markdown at all.

Markdown is definitely preferred as it keeps things easily readable and editable with a standard text editor. Github display on the website is a secondary goal -- most people won't look at it that way. Rather, they will clone the git repo and open their local copy in an editor.

That being said, I believe there is a way to do tables in github-flavored markdown, even if an automatic conversion isn't possible (can always write a one-off perl script to fix it).

Even if not, I would rather see it as a simple (non-tabular) list but keep it as plain text. Right now I can't even see what the actual change was in this pull request, because the entire file is converted to HTML.

Uploaded for consideration - *.csv (directly from tool), *.html (from tool with branding removed), .gfm (.html converted with pandoc -gfm), .md (.html converted with pandoc -markdown).

Updated per CCB 2019/10/09 review (csv format chosen)