fix(package): update hapi to version 18.1.0

Closes #42

Author: greenkeeper[bot]

package.json

@@ -9,7 +9,7 @@
     "good": "^7.0.2",
     "good-console": "^7.0.0",
     "good-squeeze": "^5.0.0",
-    "hapi": "^16.1.0",
+    "hapi": "^18.1.0",
     "hot-shots": "^5.0.0",
     "lodash": "^4.16.2",
     "pouchdb-http": "^6.0.2",