Bump underscore from 1.12.1 to 1.13.1 (#474)

Bumps [underscore](https://github.com/jashkenas/underscore) from 1.12.1 to 1.13.1.
- [Release notes](https://github.com/jashkenas/underscore/releases)
- [Commits](jashkenas/underscore@1.12.1...1.13.1)

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

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