Imports
- google.golang.org/api/iterator
- cloud.google.com/go/spanner
- cloud.google.com/go/spanner/admin/database/apiv1
- github.com/golang-migrate/migrate
- github.com/golang-migrate/migrate/database
- golang.org/x/net/context
- google.golang.org/genproto/googleapis/spanner/admin/database/v1