Go Modules on Badger and Dgraph

Also, this post seems not to accurately describe the current state of the world for github.com/dgraph-io/badger. That repo has a go.mod that says ‘module github.com/dgraph-io/badger/v2’, as it should, and the import paths have been updated. Go module users should not use v2.0.0+incompatible: it won’t work, because that’s only for non-module repos.