chore(package): update nyc to version 8.3.0

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -10,7 +10,7 @@
   "devDependencies": {
     "ava": "^0.16.0",
     "coveralls": "2.x",
-    "nyc": "8.1.0",
+    "nyc": "8.3.0",
     "standard": "8.0.0",
     "webpack": "^1.13.0"
   },