chore(package): update coveralls to version 2.11.16

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -38,7 +38,7 @@
     "request": "^2.72.0"
   },
   "devDependencies": {
-    "coveralls": "^2.11.9",
+    "coveralls": "^2.11.16",
     "eslint": "^2.12.0",
     "istanbul": "^0.4.3",
     "mocha": "^2.5.3",