Update email of maintainer (!50)

Change the email address after Yen-Chen moves from KIT to TUM.

Merged-by: Pradipta Samanta <samanta@dkrz.de>
Changelog: other

README.md

@@ -187,7 +187,7 @@ Please open a merge request and select one of our templates: __[feature/bugfix]_
 ## Contact
 This repository is mainly maintained by the following maintainers:
 - __Pradipta Samanta__ (samanta@dkrz.de)
-- __Yen-Chen Chen__ (yen-chen.chen@kit.edu)
+- __Yen-Chen Chen__ (yen-chen.chen@tum.de)
 - __Sergey Kosukhin__ (sergey.kosukhin@mpimet.mpg.de)
 
 This repository is owned by the `icon-libraries` group, contacts about general ICON library questions: