Correcting property to be passed for updated Backbone fetch() method.

See http://backbonejs.org/#upgrading
If you want to smartly update the contents of a Collection, adding new models, removing missing ones, and merging those already present, you now call set (previously named "update"), a similar operation to calling set on a Model. This is now the default when you call fetch on a collection. To get the old behavior, pass {reset: true}