expand "used by"

Author: MarcoGorelli

Diff for: README.md

@@ -45,6 +45,8 @@ Join the party!
 - [Hamilton](https://github.com/DAGWorks-Inc/hamilton/tree/main/examples/narwhals)
 - [marimo](https://github.com/marimo-team/marimo)
 - [pymarginaleffects](https://github.com/vincentarelbundock/pymarginaleffects)
+- [py-shiny](https://github.com/posit-dev/py-shiny)
+- [rio](https://github.com/rio-labs/rio)
 - [scikit-lego](https://github.com/koaning/scikit-lego)
 - [scikit-playtime](https://github.com/koaning/scikit-playtime)
 - [timebasedcv](https://github.com/FBruzzesi/timebasedcv)