Bump hapi from 15.0.2 to 18.1.0

Bumps [hapi](https://github.com/hapijs/hapi) from 15.0.2 to 18.1.0.
- [Release notes](https://github.com/hapijs/hapi/releases)
- [Changelog](https://github.com/hapijs/hapi/blob/master/CHANGELOG.md)
- [Commits](hapijs/hapi@v15.0.2...v18.1.0)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package.json

@@ -33,7 +33,7 @@
     "gulp-jshint": "2.0.1",
     "gulp-mocha": "3.0.1",
     "gulp-tag-version": "^1.2.1",
-    "hapi": "15.0.2",
+    "hapi": "18.1.0",
     "jshint-stylish": "2.2.1",
     "mocha": "3.0.2",
     "sinon": "^1.17.3",