{
  "name": "example",
  "version": "1.0.0",
  "description": "A new website created using muffin",
  "main": "index.js",
  "scripts": {
    "start": "muffin serve -w"
  },
  "author": "Your name",
  "devDependencies": {
    "broccoli-babel-transpiler": "^5.5.0",
    "broccoli-funnel": "^1.0.1",
    "broccoli-merge-trees": "^1.1.1",
    "broccoli-sass": "^0.7.0"
  },
  "dependencies": {
    "muffin": "^1.1.0"
  }
}

{
  "name": "example",
  "version": "1.0.0",
  "description": "A new website created using muffin",
  "main": "index.js",
  "scripts": {
    "start": "muffin serve -w"
  },
  "author": "Your name",
  "devDependencies": {
    "babel-preset-es2015": "^6.6.0",
    "broccoli-babel-transpiler": "^5.5.0",
    "broccoli-funnel": "^1.0.1",
    "broccoli-merge-trees": "^1.1.1",
    "broccoli-sass": "^0.7.0"
  },
  "dependencies": {
    "muffin": "^1.2.0"
  }
}

Add babel preset and update muffin
Add babel preset and update muffin
