Update dependency nyc to v15.1.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
nyc (source)	devDependencies	minor	15.0.1 -> 15.1.0

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Release Notes

istanbuljs/nyc

### [`v15.1.0`](https://togithub.com/istanbuljs/nyc/blob/master/CHANGELOG.md#​1510-httpsgithubcomistanbuljsnyccomparev1501v1510-2020-06-01) [Compare Source](https://togithub.com/istanbuljs/nyc/compare/v15.0.1...v15.1.0) ##### Features - **experimental:** Support using `--all` with node.js ESM ([#​1320](https://togithub.com/istanbuljs/nyc/issues/1320)) ([992359a](https://togithub.com/istanbuljs/nyc/commit/992359a1e2108906e28324058008f28aa1052dc1))

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