message: docs: add port to url
diff: @@ -16,7 +16,7 @@ $ yarn docker-build
  $ docker run --rm -it -p 7000:7000 -e APP_ENV=production -e NODE_ENV=development example-backend:latest
  ```
  -Then open http://localhost/ on your browser.
  +Then open http://localhost:7000 on your browser.
  ## Heroku
  