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) Signed-off-by: dependabot-preview[bot] <support@dependabot.com> Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]