chore(package): update nyc to version 8.3.1

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -29,7 +29,7 @@
     "got": "^3.2.0",
     "is-match": "^0.4.1",
     "mukla": "^0.4.4",
-    "nyc": "^8.3.0",
+    "nyc": "^8.3.1",
     "pre-commit": "^1.1.3",
     "request": "^2.57.0",
     "standard": "^8.1.0"