Update CODEOWNERS

Author: akning-ms

CODEOWNERS

@@ -20,7 +20,7 @@
 /specification/containerservice/ @yangl900
 /specification/cosmos-db/ @dmakwana @MehaKaushik @wmengmsft @shurd
 /specification/customer-insights/ @tjlvtao
-/specification/datafactory/ @shawnxzq
+/specification/datafactory/ @shawnxzq @zhangyd2015
 /specification/datalake-analytics/ @ro-joowan
 /specification/datalake-store/ @ro-joowan
 /specification/datamigration/ @hitenjava