Update nyc to the latest version 🚀

[greenkeeper]

The devDependency nyc was updated from 15.0.0-beta.0 to 15.0.0.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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Publisher: coreyfarrell
License: ISC

Find out more about this release.

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[claassistantio]

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