message: apply change to readme
diff: @@ -63,10 +63,10 @@ Run the following commands if you have Docker environment
  ```bash
  $ docker build . -t spotify/backstage
  -$ docker run --rm -it -p 3000:3000 backstage
  +$ docker run --rm -it -p 80:80 backstage
  ```
  -Then open http://localhost:3000/ on your browser.
  +Then open http://localhost/ on your browser.
  ## Documentation
  