fix(package): update fs-extra to version 3.0.1

Closes #101

Author: greenkeeper[bot]

package.json

@@ -26,7 +26,7 @@
     "commander": "2.9.0",
     "deep-diff": "0.3.7",
     "fj-compose": "^1.1.0",
-    "fs-extra": "^2.1.2",
+    "fs-extra": "^3.0.1",
     "handlebars": "^4.0.5",
     "is-object": "^1.0.1",
     "juice": "^4.0.0",