3.0.0 release

[danidee10]

• add new setting NOTIFICATIONS_DELIVERY_BACKEND
• add new setting NOTIFICATIONS_QUEUE_NAME
• Change default backend to Synchronous (Celery now has to be explicitly configured)
• Create celery backend
• Create Synchronous backend
• Create RQ Backend
• Update installation instructions (Optional dependencies)
• run each channel as a task
• Add retry functionality
• Document NOTIFICATIONS_RETRY = True and NOTIFICATIONS_RETRY_INTERVAL and NOTIFICATIONS_MAX_RETRIES
• Remove NOTIFICATIONS_PAGINATE_BY setting
• Remove NOTIFICATIONS_USE_WEBSOCKET setting
• Remove NOTIFICATIONS_RABBIT_MQ_URL setting
• Rename BasicWebSocket channel to WebSocket channel
• Use Django channels for WebSocket
• Add new setting NOTIFICATIONS_WEBSOCKET_EVENT_NAME
• Add new setting NOTIFICATIONS_WEBSOCKET_URL_PARAM
• django-jsonfield-backport to support JSONField in django < 3.1

[codeclimate[bot]]

Code Climate has analyzed commit 1ff98ffb and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 83.7% (0.0% change).

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