chore(package): update nyc to version 8.3.0 (#6)

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -28,7 +28,7 @@
   "dependencies": {},
   "devDependencies": {
     "ava": "^0.10.0",
-    "nyc": "^5.3.0",
+    "nyc": "^8.3.0",
     "xo": "^0.12.1"
   }
 }