Merge pull request #159 from docpress/greenkeeper-nyc-8.3.1

Update nyc to version 8.3.1 🚀

Author: Kikobeats

package.json

@@ -39,7 +39,7 @@
     "metalsmith": "2.2.0",
     "mocha": "3.1.2",
     "mocha-clean": "1.0.0",
-    "nyc": "8.3.0",
+    "nyc": "8.3.1",
     "standard": "8.4.0",
     "superstatic": "4.0.3"
   },