How to add packages from git to my Meteor project

I updated my Meteor project to 1.6.1 which no longer supports Meteor.uuid(). The package artwells:accounts-guest requires it and user baursn has submitted a merge of a pull request that updates the user of Meteor.uuid() to Random.id().

Artwells is yet to update the main package, so I'd like to use baursn's version. How?