Add @jeongukjae as member (#1136)

**Pull Request Checklist**
- [ ] Fixes #<!--issue number goes here-->
- [ ] Tests added
- [ ] Documentation/examples added
- [ ] [Good commit messages](https://cbea.ms/git-commit/) and/or PR
title

**Description of PR**
This PR adds @jeongukjae to member list.

Signed-off-by: Ukjae Jeong <[email protected]>

MEMBERS.md

@@ -17,3 +17,4 @@
 ## Members
 
 - Alice Purcell <[email protected]>
+- Ukjae Jeong <[email protected]>