Getting currentRouteName from application controller

application.controller.js

import Ember from 'ember';
const { computed } = Ember;

export default Ember.Controller.extend({
  needs: ['application'],
  appName:'Ember Twiddle',
  
  whereAmI: computed.readOnly('controllers.application.currentRouteName')
});

application.template.hbs

<h1>Welcome to {{whereAmI}}</h1>

twiddle.json

{
  "version": "0.4.9",
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.9/ember.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/1.13.11/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.9/ember-template-compiler.js"
  }
}