Update dependency nyc to v13.3.0

Author: renovate-bot

package.json

@@ -94,7 +94,7 @@
     "eslint-plugin-standard": "4.0.0",
     "istanbul": "0.4.5",
     "mocha": "5.2.0",
-    "nyc": "13.0.1",
+    "nyc": "13.3.0",
     "pm2": "3.1.2",
     "sequelize-cli": "4.1.1",
     "supertest": "3.3.0"