Update extract.sh

Author: ryan1640

extract.sh

@@ -2,5 +2,5 @@ echo "nightvision swagger extract ./ -t javaspringvulny-api --lang spring"
 nightvision swagger extract ./ -t javaspringvulny-api --lang spring
 echo "==================================================================="
 read
-echo "nightvision swagger diff -n openapi-spec.yml -o openapi.yaml"
-nightvision swagger diff -n openapi-spec.yml -o openapi.yaml 
+echo "nightvision swagger diff openapi.yaml openapi-spec.yml "
+nightvision swagger diff openapi.yaml openapi-spec.yml