-------------------
- Closes `Issue 212`_: Pin to Redis version 2.10.6.
- Closes `Issue 213`_: Remove unused FormView.customize_schema().
- Closes `Issue 209`_: Use pgcrypto instead of uuid-ossp (Postgres).
- Closes `Issue 215`_: UUIDModelSet now supports a label_column parameter on its constructor.
- Add Missing icon_class Property
- Upgrades Celery to version 4.3.
- Upgrades redis-py to version 3.2.
- Upgrades pytz to version 2019.1.
- Support pytest 4.x.
- Refactor validator for unique values.