chore(package): update coveralls to version 3.0.12

Closes #9

Author: greenkeeper[bot]

package.json

@@ -32,7 +32,7 @@
   "homepage": "https://github.com/simon-p-r/hapi-json-schema#readme",
   "devDependencies": {
     "code": "^4.0.0",
-    "coveralls": "^2.13.1",
+    "coveralls": "^3.0.12",
     "hapi": "^16.1.1",
     "lab": "^13.0.2"
   },