Django-extensions

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Changes:

- Fix: setup.py, add python_requires and remove legacy trove classifiers

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This is the first Django Extensions release which only targets Django 2.2 and above.
It drops official support for Python 2.7.

Changes:

- Removal of Python 2 support
- Removal of deprecated keyczar encrypted fields EncryptedTextField and EncryptedCharField
- Removal of deprecated passwd command
- Removal of truncate_letters filter
- Change: TimeStampedModel; Removed default ordering on abstract model
- New: DjangoExtensionsConfig AppConfig
- New: shell_plus, JupyterLab support
- New: list_signals, List all signals by model and signal type
- Improvement: shell_plus, use -- to directly pass additional arguments to Jupyter
- Improvement: shell_plus, improvements to MySQL support
- Improvement: jobs, use logging to record errors
- Improvement: syncdata, added --remove-before flag
- Improvement: graph_models, add field and model to template context
- Fix: syncdata, fix non existent field in fixture data
- Fix: pipchecker, compatibility with pip 20.1

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Changes:

- Fix: shell_plus, move notebook down the list of preferred shells
- Fix: sqldiff, fix KeyError when detecting missing (unique) indexes
- Improvement: encrypted fields, make it harder to use deprecated keyczar fields
- Locale: Removed empty localizations

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Changes:

- Locale: zh_Hans, removed as it generated UnicodeDecodeError errors (1478)

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Changes:

- Improvement: shell_plus, 865 always add manage.py basedir to path for notebook kernel
- Improvement: docs, add zh-Hans locale
- Improvement: runserver_plus, fix broken import for werkzeug v1.0.0
- Improvement: runserver_plus, 1461 fix always trying to load StaticFilesHandler
- Improvement: pipchecker, 1471 fix import of PipSession

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Changes:

- Improvement: travis, update pypy and pypy3 versions
- Improvement: shell_plus, ability to print location/traceback besides sql
- Improvement: runserver_plus, ability to print location/traceback besides sql
- Improvement: UniqueFieldMixin, Support Django 2.2 UniqueConstraint.condition
- Improvement: DEFAULT_MYSQL_ENGINES, add mysql.connector.django
- Improvement: shell_plus, allow setting SHELL_PLUS="notebook"
- Improvement: shell_plus, add -c/--command to shell_plus mirroring django's shell command
- Fix: shell_plus, fix postgresql debug wrapper on django 3.0 or higher
- Fix: runserver_plus, fix postgresql debug wrapper on django 3.0 or higher