Merge pull request #69 from maccyber/greenkeeper-coveralls-2.13.1

Update coveralls to version 2.13.1 🚀

Author: Jonas Enge

package.json

@@ -40,7 +40,7 @@
     "url": "http://github.com/maccyber/dockerhub-webhook/issues"
   },
   "devDependencies": {
-    "coveralls": "2.13.0",
+    "coveralls": "2.13.1",
     "nsp": "2.6.2",
     "standard": "10.0.2",
     "tap": "10.3.2"