Support markdown tables

[LKirst]

Since rich supports markdown tables, would it be possible for rich-cli to support them too?
See also the comment by @daviewales in #36

[danielfleischer]

Markdown tables are supported upstream, you just need to use rich>=13 and not rich==12.

See https://github.com/danielfleischer/rich-cli where I updated dependencies to latest.

[tompropst]

I found this also works.