Dependency on dead labix.org/v2/mgo, which itself depends on dead bazaar

[denisrobert]

Bazaar is dead, and the labix.org/v2/mgo dependency is dependent on bzr to use. Even after installing bazaar, it fails to retrieve the mgo package under the labix.org name. mgo seems to now be known as gopkg.in/mgo.v2.

[BaileyJM02]

I believe this is because the labix.org package died in favour of a fork which in turn died in favour of the official Mongo Go package now available: https://github.com/mongodb/mongo-go-driver as you can see it's only 2 years old.