Bump underscore-plus from 1.6.8 to 1.7.0
Bumps [underscore-plus](https://github.com/atom/underscore-plus) from 1.6.8 to 1.7.0.
- [Release notes](https://github.com/atom/underscore-plus/releases)
- [Commits](https://github.com/atom/underscore-plus/compare/v1.6.8...v1.7.0)
Signed-off-by: dependabot[bot] <support@dependabot.com>