Update README.md

README.md

@@ -64,7 +64,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: akhileshns/[email protected].3 # This is the action
+      - uses: akhileshns/[email protected].4 # This is the action
         with:
           heroku_api_key: ${{secrets.HEROKU_API_KEY}}
           heroku_app_name: "YOUR APP's NAME" #Must be unique in Heroku