Django-simple-history

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- Add ``app`` parameter to the constructor of ``HistoricalRecords`` (gh-486)
- Add ``custom_model_name`` parameter to the constructor of ``HistoricalRecords`` (gh-451)
- Fix header on history pages when custom site_header is used (gh-448)
- Modify ``pre_create_historical_record`` to pass ``history_instance`` for ease of customization (gh-421)
- Raise warning if ``HistoricalRecords(inherit=False)`` is in an abstract model (gh-341)
- Ensure custom arguments for fields are included in historical models' fields (gh-431)
- Add german translations (gh-484)
- Add ``extra_context`` parameter to history_form_view (gh-467)
- Fixed bug that prevented ``next_record`` and ``prev_record`` to work with custom manager names (gh-501)

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- Add ``'+'`` as the ``history_type`` for each instance in ``bulk_history_create`` (gh-449)
- Add support for ``history_change_reason`` for each instance in ``bulk_history_create`` (gh-449)
- Add ``history_change_reason`` in the history list view under the ``Change reason`` display name (gh-458)
- Fix bug that caused failures when using a custom user model (gh-459)

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- Add ability to cascade delete historical records when master record is deleted (gh-440)
- Added Russian localization (gh-441)

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- Add pre and post create_historical_record signals (gh-426)
- Remove support for ``django_mongodb_engine`` when converting AutoFields (gh-432)
- Add support for Django 2.1 (gh-418)

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- Add ability to diff ``HistoricalRecords`` (gh-244)

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- Add ability to specify alternative user_model for tracking (gh-371)
- Add util function ``bulk_create_with_history`` to allow bulk_create with history saved (gh-412)