chore: add Sijun and Silvano as CODEOWNERS (#813)
This ensures they are automatically tagged in PRs for reviews.
diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index 30c3973..f3c8219 100644
--- a/.github/CODEOWNERS
+++ b/.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
+* @arithmetic1728 @silvolu @googleapis/yoshi-python
# The python-samples-reviewers team is the default owner for samples changes
-/samples/ @googleapis/python-samples-owners
\ No newline at end of file
+/samples/ @googleapis/python-samples-owners