chore(deps-dev): bump nyc from 11.9.0 to 15.1.0

Bumps [nyc](https://github.com/istanbuljs/nyc) from 11.9.0 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@v11.9.0...v15.1.0)

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

package.json

@@ -36,7 +36,7 @@
     "@types/node": "4.9.3",
     "@types/prettier": "2.0.2",
     "codecov": "3.7.1",
-    "nyc": "11.9.0",
+    "nyc": "15.1.0",
     "prettier": "2.0.5",
     "standard-version": "4.4.0",
     "tslint": "6.1.2",