Update email of maintainer

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

How urgent is the bugfix

• I need it as soon as possible
• I can wait for a couple of days
• None of my current codes is directly affected

Mandatory steps before review

• Gitlab CI passes (Hint: use make format for linting)
• Bugfix is covered by additional unit tests
• Mark the merge request as ready by removing Draft:

Mandatory steps before merge

• Reviewed by a maintainer
• Incorporate review suggestions
• Remember to edit the commit message and select the proper changelog category (feature/bugfix/other)
• Prior to merging, please remove any boilerplate from the MR description, retaining only the What is the bug and How do you fix it section to maintain

You are not supposed to merge this request by yourself, the maintainers of libiconmath take care of this action!

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: