Bump nyc from 11.3.0 to 12.0.2

Bumps [nyc](https://github.com/istanbuljs/nyc) from 11.3.0 to 12.0.2.
- [Release notes](https://github.com/istanbuljs/nyc/releases)
- [Changelog](https://github.com/istanbuljs/nyc/blob/master/CHANGELOG.md)
- [Commits](istanbuljs/nyc@v11.3.0...v12.0.2)

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

package.json

@@ -62,7 +62,7 @@
     "lerna": "^2.0.0",
     "mocha": "^4.0.1",
     "mocha-lcov-reporter": "^1.3.0",
-    "nyc": "^11.3.0",
+    "nyc": "^12.0.2",
     "remark": "^8.0.0",
     "remark-lint": "^6.0.1",
     "rollup": "^0.51.5",