Update CODEOWNERS (#3521)

Author: mpoke

.github/CODEOWNERS

@@ -1,12 +1,8 @@
 # CODEOWNERS: https://help.github.com/articles/about-codeowners/
 
 # Primary repo maintainers
-*       @cosmos/informal_gaia_maintain @cosmos/interchain_inc_gaia_write
-
-# CODEOWNERS for the CODEOWNER file
-
-/.github/CODEOWNERS @cosmos/informal_gaia_maintain
+*       @cosmos/interchain_inc_gaia_write
 
 # CODEOWNERS for interchain tests
 
-/tests/interchain @dasanchez @LexaMichaelides @fastfadingviolets @cosmos/informal_gaia_maintain @cosmos/interchain_inc_gaia_write
+/tests/interchain @dasanchez @LexaMichaelides @fastfadingviolets @cosmos/interchain_inc_gaia_write