chore(package): update @types/fs-extra to version 9.0.1

Closes #117

Author: greenkeeper[bot]

package.json

@@ -74,7 +74,7 @@
     "yargs": "^15.0.2"
   },
   "devDependencies": {
-    "@types/fs-extra": "^8.0.1",
+    "@types/fs-extra": "^9.0.1",
     "@types/lodash": "^4.14.149",
     "@types/yargs": "^13.0.3",
     "react": "^16.12.0",