chore(deps-dev): bump hexo-util from 2.5.0 to 2.6.1 (#218)

Bumps [hexo-util](https://github.com/hexojs/hexo-util) from 2.5.0 to 2.6.1.
- [Release notes](https://github.com/hexojs/hexo-util/releases)
- [Commits](hexojs/hexo-util@2.5.0...2.6.1)

---
updated-dependencies:
- dependency-name: hexo-util
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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