Extend owners of skylib. (#355)

diff --git a/CODEOWNERS b/CODEOWNERS
index a78f3c9..99094d4 100644
--- a/CODEOWNERS
+++ b/CODEOWNERS
@@ -1,3 +1,3 @@
 # More details on syntax here: https://help.github.com/articles/about-codeowners/
-* @brandjon @tetromino
+* @brandjon @tetromino @comius @hvadehra @c-mita
 /gazelle/ @achew22 @jayconrod