Update governance (#913)

Author: pietrolesci

docs/source/governance.rst

@@ -20,3 +20,4 @@ Core Maintainers
 - Aniket Maurya (`aniketmaurya <https://github.com/aniketmaurya>`_)
 - Ananya Harsh Jha (`ananyahjha93 <https://github.com/ananyahjha93>`_)
 - Sivaraman Karthik Rangasai (`karthikrangasai <https://github.com/karthikrangasai>`_)
+- Pietro Lesci (`pietrolesci <https://github.com/pietrolesci>`_)