build(deps-dev): Bump nyc from 14.1.1 to 15.0.0

Bumps [nyc](https://github.com/istanbuljs/nyc) from 14.1.1 to 15.0.0.
- [Release notes](https://github.com/istanbuljs/nyc/releases)
- [Changelog](https://github.com/istanbuljs/nyc/blob/master/CHANGELOG.md)
- [Commits](istanbuljs/nyc@v14.1.1...v15.0.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -32,7 +32,7 @@
     "cz-conventional-changelog": "3.0.2",
     "dirty-chai": "2.0.1",
     "mocha": "6.2.2",
-    "nyc": "14.1.1",
+    "nyc": "15.0.0",
     "rimraf": "3.0.0",
     "semantic-release": "15.13.24",
     "standard": "12.0.1",