added PyPI badge

README.md

@@ -5,9 +5,9 @@ alt="Mitsuba banner">
 
 # Mitsuba Renderer 3
 
-| Documentation  | Tutorial videos  | Linux             | MacOS             | Windows           |
-|      :---:     |      :---:       |       :---:       |       :---:       |       :---:       |
-| [![docs][1]][2]| [![vids][9]][10] | [![rgl-ci][3]][4] | [![rgl-ci][5]][6] | [![rgl-ci][7]][8] |
+| Documentation  | Tutorial videos  | Linux             | MacOS             | Windows           |       PyPI        |
+|      :---:     |      :---:       |       :---:       |       :---:       |       :---:       |       :---:       |
+| [![docs][1]][2]| [![vids][9]][10] | [![rgl-ci][3]][4] | [![rgl-ci][5]][6] | [![rgl-ci][7]][8] | [![pypi][11]][12] |
 
 [1]: https://readthedocs.org/projects/mitsuba/badge/?version=stable
 [2]: https://mitsuba.readthedocs.io/en/stable/
@@ -19,6 +19,8 @@ alt="Mitsuba banner">
 [8]: https://rgl-ci.epfl.ch/viewType.html?buildTypeId=Mitsuba3_WindowsAmd64msvc2020&guest=1
 [9]: https://img.shields.io/badge/YouTube-View-green?style=plastic&logo=youtube
 [10]: https://www.youtube.com/watch?v=9Ja9buZx0Cs&list=PLI9y-85z_Po6da-pyTNGTns2n4fhpbLe5&index=1
+[11]: https://img.shields.io/pypi/v/mitsuba.svg?color=green
+[12]: https://pypi.org/pypi/mitsuba
 
 ## Introduction