Breaking changes:
I bumped to a new major version because now the plugin object is the default export of this module (there's no more an exported "plugin" attribute). Asides, it works the same, albeit some code has been rewritten using async/await (which is the big novelty of Hapi.17x).
Please check the README to register the plugin with your Hapi 17.x setup. If you're using Hapi 16.x, you probably want to use an earlier version of this module (v4.0.0), if not the original hapi-sequelize directly.