Update CODEOWNERS

Author: sawenzel

CODEOWNERS

@@ -1,4 +1,4 @@
-* @davidrohr @martenole @shahor02 @chiarazampolli
+* @davidrohr @martenole @shahor02 @chiarazampolli @sawenzel
 /DATA/production @davidrohr @martenole @shahor02 @chiarazampolli
 
 /DATA/testing/detectors/CPV
@@ -16,3 +16,5 @@
 /DATA/testing/detectors/TPC @wiechula
 /DATA/testing/detectors/TRD @martenole
 /DATA/testing/detectors/ZDC
+
+/MC @sawenzel @chiarazampolli