Merge pull request #352 from isleofcode/greenkeeper/fs-extra-4.0.0

Update fs-extra to the latest version 🚀

Author: alexblom

package.json

@@ -61,7 +61,7 @@
     "core-object": "^3.1.3",
     "ember-cli": "^2.16.2",
     "ember-cli-babel": "^6.0.0",
-    "fs-extra": "^3.0.0",
+    "fs-extra": "^4.0.0",
     "htmlparser2": "^3.9.2",
     "leek": "0.0.24",
     "lodash": "^4.13.1",