Adding through relationship to Wiki and User models

John -

In reading the exercise doc, this part did not get added before so I am correcting it. The Wiki and User models needed a 'through' piece. I think I did this correctly, let me know.

Regards,
Michelle
I think it'll be confusing to have wiki.user and wiki.users, so you might want to name it differently:

has_many :collaborators, through: :collaborations, class_name: 'User'

That will give you wiki.user and wiki.collaborators