Update nyc to the latest version 🚀 (#6725)

* chore(package): update nyc to version 15.1.0

* chore(package): update lockfile package-lock.json

Co-authored-by: greenkeeper[bot] <23040076+greenkeeper[bot]@users.noreply.github.com>

Author: greenkeeper[bot]

package-lock.json

@@ -89,7 +89,7 @@
     "lint-staged": "10.2.3",
     "mongodb-runner": "4.8.0",
     "node-fetch": "2.6.0",
-    "nyc": "15.0.1",
+    "nyc": "15.1.0",
     "prettier": "2.0.5"
   },
   "scripts": {