Bump approvals from 7.1.3 to 7.2.1

Bumps [approvals](https://github.com/approvals/Approvals.NodeJS) from 7.1.3 to 7.2.1.
- [Release notes](https://github.com/approvals/Approvals.NodeJS/releases)
- [Commits](approvals/Approvals.NodeJS@v7.1.3...v7.2.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]