chore(deps): bump hexo-util from 1.9.0 to 2.1.0 (#184)

Bumps [hexo-util](https://github.com/hexojs/hexo-util) from 1.9.0 to 2.1.0.
- [Release notes](https://github.com/hexojs/hexo-util/releases)
- [Commits](hexojs/hexo-util@1.9.0...2.1.0)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

package.json

@@ -39,7 +39,7 @@
     "bluebird": "^3.5.0",
     "chalk": "^4.0.0",
     "hexo-fs": "^2.0.0",
-    "hexo-util": "^1.0.0",
+    "hexo-util": "^2.1.0",
     "moment": "^2.18.0",
     "nunjucks": "^3.2.1"
   },