Bump underscore from 1.13.7 to 1.13.8 in /lang/js (#3661)

Bumps [underscore](https://github.com/jashkenas/underscore) from 1.13.7 to 1.13.8.
- [Commits](https://github.com/jashkenas/underscore/commits)

---
updated-dependencies:
- dependency-name: underscore
  dependency-version: 1.13.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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