Warning message output from hook.js

[sonycamera]

Version 2.9.0

I'm using transaction.start()/end() hooks in my project. I saw a warning message printed on console in debug:
(node:3889) Warning: .then() only accepts functions but was passed: [object Object]

It seems that there is a typo in function end()/rollback() in hook.js:

      return trx.commit()
        .then(() => debug('finished transaction %s with success', id))
        .then(hook);

When I removed .then(hook), the warning message disappeared.

[daffl]

That is definitely not right. Can you change it to

      return trx.commit()
        .then(() => debug('finished transaction %s with success', id))
        .then(() => hook);

And submit a PR?

[sonycamera]

OK, PR created #137

[daffl]

Closed via #137