Add log of incorrect operation

listener.go

diff --git a/listener.go b/listener.go
index 43bab9a..0f5c493 100644
--- a/listener.go
+++ b/listener.go
@@ -160,6 +160,8 @@
 					DataScopeID: dataScopeID,
 				}
 				deploymentsToDelete = append(deploymentsToDelete, dep)
+			default:
+				log.Errorf("unexpected operation: %s", change.Operation)
 			}
 		}
 	}