fix(package): update fs-extra to version 8.1.0

Closes #31

Author: greenkeeper[bot]

package.json

@@ -82,7 +82,7 @@
     "webpack-dev-server": "^3.1.4"
   },
   "dependencies": {
-    "fs-extra": "^7.0.1",
+    "fs-extra": "^8.1.0",
     "react": "^16.4.1",
     "react-dom": "^16.4.1",
     "react-router-dom": "^4.3.1"