chore(package): update nyc to version 11.7.3

Closes #13

Author: greenkeeper[bot]

package.json

@@ -50,7 +50,7 @@
     "loopback": "3.8.0",
     "mocha": "3.4.2",
     "mocha-sinon": "2.0.0",
-    "nyc": "11.0.3",
+    "nyc": "11.7.3",
     "semantic-release": "6.3.6",
     "sinon": "2.3.6",
     "sinon-chai": "2.11.0",