Add codeowner for Modbus (#152163)

CODEOWNERS

@@ -970,6 +970,8 @@ build.json @home-assistant/supervisor
 /tests/components/moat/ @bdraco
 /homeassistant/components/mobile_app/ @home-assistant/core
 /tests/components/mobile_app/ @home-assistant/core
+/homeassistant/components/modbus/ @janiversen
+/tests/components/modbus/ @janiversen
 /homeassistant/components/modem_callerid/ @tkdrob
 /tests/components/modem_callerid/ @tkdrob
 /homeassistant/components/modern_forms/ @wonderslug

homeassistant/components/modbus/manifest.json

@@ -1,7 +1,7 @@
 {
   "domain": "modbus",
   "name": "Modbus",
-  "codeowners": [],
+  "codeowners": ["@janiversen"],
   "documentation": "https://www.home-assistant.io/integrations/modbus",
   "iot_class": "local_polling",
   "loggers": ["pymodbus"],