Preset-sqlalchemy-redshift

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- Allow supplying multiple role ARNs in COPY and UNLOAD commands. This allows
the first role to assume other roles as explained
`here <https://docs.aws.amazon.com/redshift/latest/mgmt/authorizing-redshift-service.html#authorizing-redshift-service-chaining-roles>`_.

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- Support AWS partitions for role-based access control in COPY and UNLOAD
commands. This allows these commands to be used, e.g. in GovCloud.

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- Add option to drop materialized view with CASCADE
(`Pull 204 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/204>`_)
- Fix invalid SQLAlchemy version comparison
(`Pull 206 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/206>`_)

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- Fix for supporting SQLAlchemy 1.3.11+
(`Issue 195 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/195>`_)

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- Added support for materialized views
(`Issue 202 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/202>`_)
- Fix reflection of unique constraints
(`Issue 199 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/pull/199>`_)
- Support for altering column comments in Alembic migrations
(`Issue 191 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/issues/191>`_)

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- Import Iterable from collections.abc for Python 3.9 compatibility
(`Issue 189 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/issues/189>`_)
- Add support for Parquet format in ``UNLOAD`` command
(`Issue 187 <https://github.com/sqlalchemy-redshift/sqlalchemy-redshift/issues/187>`_)