chore(package): update nyc to version 14.1.1

Closes #15

Author: greenkeeper[bot]

package.json

@@ -50,7 +50,7 @@
     "babel-preset-es2015": "^6.9.0",
     "coveralls": "^3.0.0",
     "eslint-config-xo-lukechilds": "^1.0.0",
-    "nyc": "^11.0.2",
+    "nyc": "^14.1.1",
     "window": "^4.1.0",
     "xo": "^0.20.1"
   }