chore(package): update nyc to version 14.0.0

Closes #69

Author: greenkeeper[bot]

package.json

@@ -41,7 +41,7 @@
     "ava": "^0.25.0",
     "coveralls": "^3.0.0",
     "eslint-config-xo-lukechilds": "^1.0.0",
-    "nyc": "^11.0.2",
+    "nyc": "^14.0.0",
     "xo": "^0.18.2"
   }
 }