chore: add averikitsch as owner for library code (#54)

Author: busunkim96

.github/CODEOWNERS

@@ -5,7 +5,7 @@
 # https://help.github.com/en/github/creating-cloning-and-archiving-repositories/about-code-owners#codeowners-syntax
 
 # The @googleapis/yoshi-python is the default owner for changes in this repo
-*               @googleapis/yoshi-python
+*               @averikitsch @googleapis/yoshi-python
 
 
-/samples/**/*.py                           @averikitsch @googleapis/python-samples-owners
+/samples/**/*.py                           @averikitsch @googleapis/python-samples-owners