chore(package): update coveralls to version 3.0.13

Closes #52

Author: greenkeeper[bot]

package.json

@@ -34,7 +34,7 @@
   },
   "devDependencies": {
     "ava": "^0.20.0",
-    "coveralls": "^2.11.9",
+    "coveralls": "^3.0.13",
     "eslint": "^3.1.1",
     "eslint-config-pedant": "^0.9.0",
     "nyc": "^10.0.0"