Scalding v0.15.0 Release Notes

    • 🚚 Move OrderedSerialization into zero-dep scalding-serialization module #1289
    • ⬆️ bump elephantbird to 4.8 #1292
    • 🛠 Fix OrderedSerialization for some forked graphs #1293
    • ➕ Add serialization modules to aggregate list #1298