Imports
- github.com/Masterminds/semver
- github.com/Masterminds/vcs
- github.com/armon/go-radix
- github.com/boltdb/bolt
- github.com/golang/dep/internal/fs
- github.com/golang/dep/internal/gps/paths
- github.com/golang/dep/internal/gps/pkgtree
- github.com/nightlyone/lockfile
- github.com/pkg/errors
- github.com/sdboyer/constext
- golang.org/x/sync/errgroup