Update nyc to version 14.1.1

Author: depfu[bot]

package.json

@@ -16,7 +16,7 @@
     "@babel/cli": "7.2.0",
     "@babel/core": "7.2.0",
     "prettier": "2.0.4",
-    "nyc": "13.1.0",
+    "nyc": "14.1.1",
     "jest": "23.2.0"
   },
   "license": "MIT"