build(deps-dev): bump util from 0.12.3 to 0.12.4 in /html (#704)

Bumps [util](https://github.com/browserify/node-util) from 0.12.3 to 0.12.4.
- [Release notes](https://github.com/browserify/node-util/releases)
- [Changelog](https://github.com/browserify/node-util/blob/master/CHANGELOG.md)
- [Commits](https://github.com/browserify/node-util/compare/v0.12.3...v0.12.4

)

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

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