README.md in circleci-bundle-update-pr-1.12.0 vs README.md in circleci-bundle-update-pr-1.13.0

@@ -113,9 +113,10 @@
 $ circleci-bundle-update-pr -h
 Usage: circleci-bundle-update-pr [options]
     -a, --assignees alice,bob,carol  Assign the PR to them
     -r, --reviewers alice,bob,carol  Request PR review to them
     -l, --labels "In Review, Update" Add labels to the PR
+    -d, --duplicate                  Make PR even if it has already existed
 ```
 
 ## Contributing
 
 1. Fork it ( https://github.com/masutaka/circleci-bundle-update-pr/fork )