chore(deps): update dependency nyc to v15

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
nyc	devDependencies	major	^14.0.0 -> ^15.0.0

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Release Notes

istanbuljs/nyc

### [`v15.0.0`](https://togithub.com/istanbuljs/nyc/blob/master/CHANGELOG.md#​1500httpsgithubcomistanbuljsnyccomparev1411v1500-2019-12-20) [Compare Source](https://togithub.com/istanbuljs/nyc/compare/v14.1.1...v15.0.0) ##### ⚠ BREAKING CHANGES - The `flow` and `jsx` parser plugins are no longer enabled by default. - Node.js 8 is now required to run nyc - Remove NYC_ROOT_ID and NYC_INSTRUMENTER environmental variables. - The `root` field has been removed from processinfo files. ##### Features - Add `--use-spawn-wrap=true` option ([#​1169](https://togithub.com/istanbuljs/nyc/issues/1169)) ([df4de4d](https://togithub.com/istanbuljs/nyc/commit/df4de4d490f8cd32204fba66a810ed0444c26d0d)) - Add `.cjs`, `.mjs`, `.ts`, `.tsx`, `.jsx` to default extensions ([#​1110](https://togithub.com/istanbuljs/nyc/issues/1110)) ([914b776](https://togithub.com/istanbuljs/nyc/commit/914b776215ad3ea54f0e46b4ba2904a8a9d4dfdd)), closes [#​1103](https://togithub.com/istanbuljs/nyc/issues/1103) - Allow `nyc instrument` to instrument code in place ([#​1149](https://togithub.com/istanbuljs/nyc/issues/1149)) ([7783284](https://togithub.com/istanbuljs/nyc/commit/77832845b85134d21eca3a23c812c4f21f36713f)) - Drop node.js 6, upgrade dependencies ([#​1134](https://togithub.com/istanbuljs/nyc/issues/1134)) ([00c3b34](https://togithub.com/istanbuljs/nyc/commit/00c3b3440a5b2ffe11b9c19ae4e08ad2f5b70e33)) - Filenames relative to project cwd in coverage reports ([#​1212](https://togithub.com/istanbuljs/nyc/issues/1212)) ([5258e9f](https://togithub.com/istanbuljs/nyc/commit/5258e9fdb1d9e3d4abd4cc9768bc09cd8040a6be)) - Use [@​istanbuljs/schema](https://togithub.com/istanbuljs/schema) for yargs setup ([#​1194](https://togithub.com/istanbuljs/nyc/issues/1194)) ([fd40d49](https://togithub.com/istanbuljs/nyc/commit/fd40d49331665d936b86f30e9a873ba80071b770)) - Use istanbul-lib-processinfo ([#​1145](https://togithub.com/istanbuljs/nyc/issues/1145)) ([7943413](https://togithub.com/istanbuljs/nyc/commit/7943413dc032f8f98a164fdde88d7344e817bb5e)) - Use source base name to prefix cache files ([#​1144](https://togithub.com/istanbuljs/nyc/issues/1144)) ([5c1b7a9](https://togithub.com/istanbuljs/nyc/commit/5c1b7a9c43771f3439af44a1104e5426519e1123)) ##### Bug Fixes - Avoid `source-map` module during `signal-exit` handler ([#​1191](https://togithub.com/istanbuljs/nyc/issues/1191)) ([83eb629](https://togithub.com/istanbuljs/nyc/commit/83eb6294f9492bf98405ee9fdf6281c3bc199a3d)) - Better error handling for main execution, reporting ([#​1229](https://togithub.com/istanbuljs/nyc/issues/1229)) ([dfd629d](https://togithub.com/istanbuljs/nyc/commit/dfd629d95716e6159aa7216c03e28a7fbbb161e7)) - Correct handling of source-maps for pre-instrumented files ([#​1216](https://togithub.com/istanbuljs/nyc/issues/1216)) ([8411a26](https://togithub.com/istanbuljs/nyc/commit/8411a26c9e520c66251cc8044cde2c81f33f1c5f)), closes [#​1208](https://togithub.com/istanbuljs/nyc/issues/1208) - Drop coverage produced by `nyc --all` for files that were tested ([#​1155](https://togithub.com/istanbuljs/nyc/issues/1155)) ([fc1bbbf](https://togithub.com/istanbuljs/nyc/commit/fc1bbbf490f6ab0272359ce10ceb4987d1716256)), closes [#​1113](https://togithub.com/istanbuljs/nyc/issues/1113) [#​1124](https://togithub.com/istanbuljs/nyc/issues/1124) [#​1148](https://togithub.com/istanbuljs/nyc/issues/1148) - Honor eager setting (false by default) ([#​1179](https://togithub.com/istanbuljs/nyc/issues/1179)) ([c18fb0a](https://togithub.com/istanbuljs/nyc/commit/c18fb0a9a8eae5904298d87c62d9934243de8674)) - Remove vestigial environment variables ([#​1078](https://togithub.com/istanbuljs/nyc/issues/1078)) ([cfd3da0](https://togithub.com/istanbuljs/nyc/commit/cfd3da05156b98952f03f7be2dd3d23ba328073f))

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Codecov Report

Merging #145 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #145   +/-   ##
=======================================
  Coverage   94.11%   94.11%           
=======================================
  Files           1        1           
  Lines          17       17           
  Branches        7        7           
=======================================
  Hits           16       16           
  Partials        1        1

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As this PR has been closed unmerged, Renovate will ignore this upgrade and you will not receive PRs for any future 15.x releases. However, if you upgrade to 15.x manually then Renovate will then reenable updates for minor and patch updates automatically.

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