chore(package): update nyc to version 9.0.1

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -65,7 +65,7 @@
     "eslint": "^3.7.1",
     "eslint-plugin-ava": "^4.0.0",
     "husky": "^0.11.9",
-    "nyc": "^8.4.0",
+    "nyc": "^9.0.1",
     "rimraf": "^2.5.4",
     "validate-commit-msg": "^2.8.2"
   },