Merge pull request #997 from NodeRedis/greenkeeper-nyc-6.0.0

Update nyc to version 6.0.0 🚀

Author: BridgeAR

package.json

@@ -37,7 +37,7 @@
     "jshint": "^2.8.0",
     "metrics": "^0.1.9",
     "mocha": "^2.3.2",
-    "nyc": "^5.2.0",
+    "nyc": "^6.0.0",
     "optional-dev-dependency": "^1.1.0",
     "tcp-port-used": "^0.1.2",
     "uuid": "^2.0.1",