chore: update read to include pyo3-polars (pola-rs#6101)

Author: ritchie46

README.md

@@ -192,15 +192,10 @@ Note that the Rust crate implementing the Python bindings is called `py-polars`
 Rust crate `polars` itself. However, both the Python package and the Python module are named `polars`, so you
 can `pip install polars` and `import polars`.
 
-## Arrow2
-
-Polars has transitioned to [arrow2](https://crates.io/crates/arrow2).
-Arrow2 is a faster and safer implementation of the [Apache Arrow Columnar Format](https://arrow.apache.org/docs/format/Columnar.html).
-Arrow2 also has a more granular code base, helping to reduce the compiler bloat.
-
 ## Use custom Rust function in python?
 
-See [this example](./examples/python_rust_compiled_function).
+Extending polars with UDFs compiled in Rust is easy. We expose pyo3 extensions for `DataFrame` and `Series`
+data structures. See more in https://github.com/pola-rs/pyo3-polars.
 
 ## Going big...