update headers

main.go

@@ -75,7 +75,7 @@ func main() {
 	defer f.Close()
 
 	w := csv.NewWriter(f)
-	if err := w.Write([]string{"UID", "FirstName", "LastName", "Status", "ExamID"}); err != nil {
+	if err := w.Write([]string{"uid", "first_name", "last_name", "status", "exam_id"}); err != nil {
 		log.Fatalf("failed to write csv header: %v", err)
 	}
 	for _, u := range users {