chore(package): update hapi to version 18.0.1

Closes #11

Author: greenkeeper[bot]

package.json

@@ -33,7 +33,7 @@
   "devDependencies": {
     "code": "^4.0.0",
     "coveralls": "^2.13.1",
-    "hapi": "^16.1.1",
+    "hapi": "^18.0.1",
     "lab": "^13.0.2"
   },
   "dependencies": {