[3.0.0] Command markdown-it does not allow activating support for tables? 😢 #352

Hi! 👋

I just learned that markdown-it README.md > README.htm does not render tables, that markdown-it --help does not show any related switches and that I need something like…

python3 -c 'import sys; from markdown_it import MarkdownIt; md = MarkdownIt("commonmark").enable("table"); print(md.render(sys.stdin.read()))' < README.md > README.htm

…to render with support for tables active. Is there a chance that maybe a commend line argument --enable-tables could be added?

Thanks and best, Sebastian