Django-redshift-backend

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* fix trove classifier 'License' from BSD to Apache.
* Documentation: Add `Contribution Guideline`_

.. _Contribution Guideline: https://django-redshift-backend.readthedocs.io/en/master/dev.html#contribution-guideline

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* 35: Drop support for Django 1.8, 1.9 and 1.10.
* 40: Support Django 2.0.
* 42: Support DISTKEY. Thanks to Benjy Weinberger.
* Documentation: http://django-redshift-backend.rtfd.io/
* Change LICENSE from 'BSD License' to 'Apache Software License'

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* 38: Fix 0.8 doesn't compatible with Python 2. Thanks to Benjy Weinberger.

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Incompatible Changes:

* 23,10: Redshift support time zones in time stamps for migration

**IMPORTANT**:
With this change, the newly created DateTimeField column will be timestamp
with timezone (TIMESTAMPTZ) by migration. Therefore, the existing
DateTimeField and the new DateTimeField will have different data types as a
redshift schema column type.
There are no migration feature by django-redshift-backend.
see also: https://github.com/jazzband/django-redshift-backend/pull/23

New Features:

* 20,26: Support for sortkey. Thanks to Maxime Vdb and Kosei Kitahara.
* 24: Add UUIDField support. Thanks to Sindri Guðmundsson.
* 14: More compat with redshift: not use SELECT DISTINCT ON.

Bug Fixes:

* 15,21: More compat with redshift: not use CHECK. Thanks to Vasil Vangelovski.
* 18: Fix error on migration with django-1.9 or later that raises AttributeError
of 'sql_create_table_unique'.
* 27: annotate() does not work on Django-1.9 and later. Thanks to Takayuki Hirai.


Documentation:

* Add documentation: http://django-redshift-backend.rtfd.io/

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* Drop Python-3.4
* Drop Django-1.7
* Support Python-3.6
* Support Django-1.11

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* Fix crush problem when using bulk insert.