chore(deps-dev): update hexo-fs requirement from ^1.0.0 to ^2.0.0

Updates the requirements on [hexo-fs](https://github.com/hexojs/hexo-fs) to permit the latest version.
- [Release notes](https://github.com/hexojs/hexo-fs/releases)
- [Commits](https://github.com/hexojs/hexo-fs/commits)

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

package.json

@@ -33,7 +33,7 @@
     "chai": "^4.2.0",
     "eslint": "^6.0.1",
     "eslint-config-hexo": "^3.0.0",
-    "hexo-fs": "^1.0.0",
+    "hexo-fs": "^2.0.0",
     "mocha": "^6.0.2",
     "nyc": "^14.1.1"
   },