Upgrade fs-extra to 1.0.0

Summary:
fs-extra's first stable release is out since 1 of November.
I think its time to upgrade to 1.0.0. We've been running 1.0.0 locally and is having no problems with it.

**Test plan (required)**

Walked through the commits from 0.30 to 1.0.0 and no breaking changes has been made to the repository. https://github.com/jprichardson/node-fs-extra/compare/1.0.0...1.x
Closes https://github.com/facebook/react-native/pull/11542

Reviewed By: zertosh

Differential Revision: D4444576

Pulled By: hramos

fbshipit-source-id: 520311af8dc0911c026c08bdb74bec6572e7e17f

package.json

@@ -162,7 +162,7 @@
     "fbjs": "~0.8.9",
     "fbjs-scripts": "^0.7.0",
     "form-data": "^2.1.1",
-    "fs-extra": "^0.26.2",
+    "fs-extra": "^1.0.0",
     "glob": "^5.0.15",
     "graceful-fs": "^4.1.3",
     "image-size": "^0.3.5",