build(deps-dev): bump nyc from 15.0.0 to 15.0.1
build(deps-dev): bump nyc from 15.0.0 to 15.0.1

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](https://github.com/istanbuljs/nyc/compare/v15.0.0...v15.0.1)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
jeffjewiss/broccoli-postcss