Runs the app in the development mode.
The browser should open automatically to http://localhost:3000. If the browser does not open, you can open it manually and visit the URL.
The page will reload if you make edits. You will also see any lint errors in the console.
You may change the listening port number by using the PORT
environment variable. For example type PORT=8000 elm-app start
into the terminal/bash to run it from: http://localhost:8000/.
You can prevent the browser from opening automatically,
elm-app start --no-browser