Update Marten's status (#52)

Author: msteket

content/authors/marten/_index.md

@@ -65,7 +65,7 @@ highlight_name: false
 # Organizational groups that you belong to (for People widget)
 #   Set this to `[]` or comment out if you are not using People widget.
 user_groups:
-- Research, Technical and Administrative Support
+- Former Members
 ---
 
 <h2>About Marten</h2>