chore(package): update coveralls to version 2.13.0

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -50,7 +50,7 @@
     "clinton": "^0.11.0",
     "conventional-changelog-cli": "^1.2.0",
     "conventional-changelog-lint": "^1.1.0",
-    "coveralls": "^2.11.15",
+    "coveralls": "^2.13.0",
     "cpy": "^5.0.0",
     "eslint": "^3.14.0",
     "eslint-config-standard": "^6.2.1",