docs: update python badge (#120)

README.md

@@ -2,7 +2,7 @@
 
 [![Panda Gazebo CI](https://github.com/rickstaa/panda-gazebo/actions/workflows/panda_gazebo.yml/badge.svg)](https://github.com/rickstaa/panda-gazebo/actions/workflows/panda_gazebo.yml)
 [![GitHub release (latest by date)](https://img.shields.io/github/v/release/rickstaa/panda-gazebo)](https://github.com/rickstaa/panda-gazebo/releases)
-[![Python 3](https://img.shields.io/badge/Python-3.8%20%7C%203.7%20%7C%203.6-brightgreen)](https://www.python.org/)
+[![Python 3](https://img.shields.io/badge/Python->=3.8-brightgreen)](https://www.python.org/)
 [![ROS version](https://img.shields.io/badge/ROS%20versions-Noetic-brightgreen)](https://wiki.ros.org)
 [![Contributions](https://img.shields.io/badge/contributions-welcome-brightgreen.svg)](contributing.md)
 [![DOI](https://zenodo.org/badge/353980386.svg)](https://zenodo.org/badge/latestdoi/353980386)