chore(package): update nyc to version 14.0.0 (#345)

Author: greenkeeper[bot]

package.json

@@ -51,7 +51,7 @@
     "eslint": "^5.6.0",
     "mocha": "^6.0.0",
     "nock": "^10.0.0",
-    "nyc": "^13.0.1",
+    "nyc": "^14.0.0",
     "proxyquire": "^2.0.0",
     "should": "^13.0.0",
     "sinon": "^7.1.1"