Wrong plan subscription column reference for user

[samtoya]

The method (byUser) in the PlanSubscription model has the wrong reference to the database column,

You used user_id instead of subscribable_id

It's on line 317 in the PlanSubscription model, please fix this in your next update.

I'll share with you how I'm using the package when I'm done with my project.

Thanks.

[gerardojbaez]

Thanks for your bug report!