Update dependency nyc to v18

Author: renovate[bot]

package.json

@@ -28,7 +28,7 @@
   "homepage": "https://github.com/uniibu/queuing#readme",
   "devDependencies": {
     "eslint": "6.7.2",
-    "nyc": "^14.1.1",
+    "nyc": "^18.0.0",
     "tape": "4.11.0"
   },
   "dependencies": {}