Bump nyc from 15.0.1 to 15.1.0 (yahoo#85)

Bumps [nyc](https://github.com/istanbuljs/nyc) from 15.0.1 to 15.1.0.
- [Release notes](https://github.com/istanbuljs/nyc/releases)
- [Changelog](https://github.com/istanbuljs/nyc/blob/master/CHANGELOG.md)
- [Commits](istanbuljs/nyc@v15.0.1...v15.1.0)

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