fix(package): update fs-extra to version 3.0.0

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -57,7 +57,7 @@
   "dependencies": {
     "babel-jest": "^19.0.0",
     "babel-plugin-transform-es2015-modules-commonjs": "^6.24.1",
-    "fs-extra": "^2.1.2",
+    "fs-extra": "^3.0.0",
     "glob-all": "^3.1.0",
     "istanbul-lib-instrument": "^1.2.0",
     "jest-config": "^19.0.0",