chore(package): update nyc to version 11.2.0

Closes #23

Author: greenkeeper[bot]

package.json

@@ -60,7 +60,7 @@
     "loopback-testing": "1.4.0",
     "mocha": "3.4.2",
     "nodemon": "1.11.0",
-    "nyc": "10.3.2",
+    "nyc": "11.2.0",
     "semantic-release": "6.3.6",
     "serve-favicon": "2.4.3",
     "sinon": "2.3.5",