README is missing Plk in the comparison table.

[vi]

There is a comparsion table in the README and RATIONALE, but it seems to miss a notable configuration language: Pkl.

[yannham]

Hello, thanks for the pointer! To be faire Pkl was made public and open-sourced only 3 days ago, so we haven't had the occasion to take a deeper look into it yet. But we'll surely do, and add a section by then!