Removed unneed packages

Author: inc2734

package.json

@@ -14,7 +14,6 @@
   },
   "devDependencies": {
     "autoprefixer": "^6.5.3",
-    "babel-preset-es2015": "^6.18.0",
     "babel-preset-es2015-rollup": "^3.0.0",
     "browser-sync": "^2.18.5",
     "cssnano": "^3.8.2",