Update dependency nyc to v11.9.0

Author: renovate[bot]

package.json

@@ -87,7 +87,7 @@
     "custom-tslint-formatters": "^2.1.1",
     "nodemon": "1.12.1",
     "npm-scripts-info": "^0.3.6",
-    "nyc": "11.3.0",
+    "nyc": "11.9.0",
     "opn-cli": "^3.1.0",
     "rimraf": "^2.6.2",
     "sinon": "4.1.1",