Bump fs-extra from 4.0.3 to 8.1.0 (#159)

Bumps [fs-extra](https://github.com/jprichardson/node-fs-extra) from 4.0.3 to 8.1.0.
- [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@4.0.3...8.1.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

package.json

@@ -27,7 +27,7 @@
     "docopt": "^0.6.2",
     "download": "^6.2.5",
     "figures": "^2.0.0",
-    "fs-extra": "^4.0.2",
+    "fs-extra": "^8.1.0",
     "get-mongodb-version": "^2.0.1",
     "lodash.defaults": "^4.2.0",
     "lodash.difference": "^4.1.1",