Bump fs-extra from 8.1.0 to 9.0.0 (#229)

Bumps [fs-extra](https://github.com/jprichardson/node-fs-extra) from 8.1.0 to 9.0.0.
- [Release notes](https://github.com/jprichardson/node-fs-extra/releases)
- [Changelog](https://github.com/jprichardson/node-fs-extra/blob/master/CHANGELOG.md)
- [Commits](jprichardson/node-fs-extra@8.1.0...9.0.0)

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package.json

@@ -41,7 +41,7 @@
     "co-busboy": "^1.3.0",
     "coveralls": "^3.0.3",
     "expect.js": "0.3.x",
-    "fs-extra": "^8.1.0",
+    "fs-extra": "^9.0.0",
     "gh-pages": "^2.2.0",
     "jest": "^20.0.1",
     "pre-commit": "1.x",