Update CODE-OF-CONDUCT.md

Co-authored-by: Ferran Brosa Planella <Ferran.Brosa-Planella@warwick.ac.uk>

CODE-OF-CONDUCT.md

@@ -63,7 +63,7 @@ representative at an online or offline event.
 
 Instances of abusive, harassing, or otherwise unacceptable behavior may be
 reported to the community leaders responsible for enforcement at
-[pybamm@gmail.com](mailto:pybamm@gmail.com).
+[pybamm@pybamm.org](mailto:pybamm@pybamm.org).
 All complaints will be reviewed and investigated promptly and fairly.
 
 All community leaders are obligated to respect the privacy and security of the