Repo/update code owners (#2275)

* update code owners

* udpated PR template

.github/CODEOWNERS

@@ -5,7 +5,7 @@
 # the repo. Unless a later match takes precedence,
 # @global-owner1 and @global-owner2 will be requested for
 # review when someone opens a pull request.
-*       @hrzn @dennisbader @brunnedu
+*       @dennisbader @madtoinou @hrzn
 
 # Custom CODEOWNERS can be set up for branches with specific
 # patterns, you can find more info here:

.github/pull_request_template.md

@@ -1,3 +1,8 @@
+Checklist before merging this PR:
+- [ ] Mentioned all issues that this PR fixes or addresses.
+- [ ] Summarized the updates of this PR under **Summary**.
+- [ ] Added an entry under **Unreleased** in the [Changelog](../CHANGELOG.md). 
+
 <!-- Please mention an issue this pull request addresses. -->
 Fixes #.