message: add heroku logs commands
diff: @@ -147,6 +147,17 @@ git commit -m "add nodejs + express server"
  git push
  ```
  +- If you want to see logs:
  +
  +```bash
  +npx heroku login
  +npx heroku logs -a <heroku-app-name>
  +```
  +
  +> NOTE: [Download heroku cli](https://devcenter.heroku.com/articles/heroku-cli#download-and-install)
  +> Use `npm install -g heroku`
  +> Or using [npx](https://github.com/npm/npx)
  +
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