fix(package): update nyc to version 14.0.0

Closes #3

Author: greenkeeper[bot]

package.json

@@ -14,7 +14,7 @@
   "dependencies": {
     "chai": "^4.1.2",
     "mocha": "^4.0.1",
-    "nyc": "^11.2.1"
+    "nyc": "^14.0.0"
   },
   "devDependencies": {
     "eslint": "^4.9.0",