chore(package): update nyc to version 8.3.0 (#1143)

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -39,7 +39,7 @@
     "eslint": "^2.5.0",
     "metrics": "^0.1.9",
     "mocha": "^2.3.2",
-    "nyc": "^7.0.0",
+    "nyc": "^8.3.0",
     "tcp-port-used": "^0.1.2",
     "uuid": "^2.0.1",
     "win-spawn": "^2.0.0"