chore(package): update nyc to version 11.8.0 (#1382)

package.json

@@ -38,7 +38,7 @@
     "eslint-plugin-promise": "~3.7.0",
     "eslint-plugin-standard": "~3.0.0",
     "mocha": "~5.1.0",
-    "nyc": "~11.7.1",
+    "nyc": "~11.8.0",
     "utf-8-validate": "~4.0.0"
   }
 }