Update README.md

README.md

@@ -33,4 +33,5 @@ $ GOOS=linux GOARCH=amd64 go build -o backup git.lhk.o-r.kr/freerer2/simple_back
   backup /source /simple_backup --group-by day --compare hash
   backup /home/user/docs /simple_backup/docs -i -v
   backup /data /simple_backup -d --force
+  backup /data /simple_backup -i -g sec -c hash -v
 ```