Nominating myself (@aabmass) as codeowner (census-instrumentation#868)

Author: aabmass

.github/CODEOWNERS

@@ -2,4 +2,4 @@
 # This file controls who is tagged for review for any given pull request.
 
 # For anything not explicitly taken by someone else:
-*               @census-instrumentation/global-owners @mayurkale22 @hekike @draffensperger
+*               @census-instrumentation/global-owners @mayurkale22 @hekike @draffensperger @aabmass