readme clarify not being associated with pymatgen

Author: janosh

readme.md

@@ -2,7 +2,7 @@
 
 <h4 align="center">
 
-A toolkit for visualizations in materials informatics. Works with [`pymatgen`](https://github.com/materialsproject/pymatgen).
+A toolkit for visualizations in materials informatics.
 
 [![Tests](https://github.com/janosh/pymatviz/actions/workflows/test.yml/badge.svg)](https://github.com/janosh/pymatviz/actions/workflows/test.yml)
 [![pre-commit.ci status](https://results.pre-commit.ci/badge/github/janosh/pymatviz/main.svg)](https://results.pre-commit.ci/latest/github/janosh/pymatviz/main)
@@ -12,6 +12,8 @@ A toolkit for visualizations in materials informatics. Works with [`pymatgen`](h
 
 </h4>
 
+**Note**: This project is not associated with or endorsed by [`pymatgen`](https://github.com/materialsproject/pymatgen), but aims to complement it by adding additional plotting functionality.
+
 ## Installation
 
 ```sh