py-serializable: update to 0.15.0.

0.15.0:

Feature

    Allow custom (de)normalization (#32) (aeecd6b)

0.14.1

Fix

    JSON deserialize Decimal (#31) (b6dc66a)

0.14.0

Feature

    Enhanced typehints and typing (#27) (410372a)

0.13.1

Fix

    Protect default value for serialization_types from unintended downstream modifications (#30) (0e814f5)

0.13.0

Feature

    Format specific (de)serialize (#25) (dc998df)

0.12.1

Fix

    Xml defaultNamespace serialization and detection (#20) (59eaa5f)

(wiz)