Upgrade: bump nyc from 15.0.0 to 15.0.1 (#57)

Bumps [nyc](https://github.com/istanbuljs/nyc) from 15.0.0 to 15.0.1.
- [Release notes](https://github.com/istanbuljs/nyc/releases)
- [Changelog](https://github.com/istanbuljs/nyc/blob/master/CHANGELOG.md)
- [Commits](istanbuljs/nyc@v15.0.0...v15.0.1)

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