Django-pg-zero-downtime-migrations

- added support for `serial` and `integer`, `bigserial` and `bigint`, as well as `smallserial` and `smallint`, implementing the same type changes as safe migrations
- fixed the `AutoField` type change and concurrent insertion issue for django < 4.1
- added sequence dropping and creation timeouts, as they can be used with the `CASCADE` keyword and may affect other tables
- added django 4.1 support
- added python 3.11 support
- added postgres 15 support
- marked postgres 10 support as deprecated
- dropped django 2.2 support
- dropped django 3.0 support
- dropped django 3.1 support
- dropped postgres 9.5 support
- dropped postgres 9.6 support
- added github actions checks for pull requests

- fixed an issue where renaming a model while keeping `db_table` raised an `ALTER_TABLE_RENAME` error (26)
- added django 3.2 support
- added django 4.0 support
- added python 3.9 support
- added python 3.10 support
- added postgres 14 support
- marked django 2.2 support as deprecated
- marked django 3.0 support as deprecated
- marked django 3.1 support as deprecated
- marked python 3.6 support as deprecated
- marked python 3.7 support as deprecated
- marked postgres 9.5 support as deprecated
- marked postgres 9.6 support as deprecated
- switched to github actions for testing

- added django 3.1 support
- added postgres 13 support
- dropped python 3.5 support
- updated the test environment

- fixed the decimal-to-float migration error
- fixed tests for django 3.0.2 and later

- added django 3.0 support
- added support for concurrent index creation and removal operations
- added support for exclude constraints as an unsafe operation
- dropped postgres 9.4 support
- dropped django 2.0 support
- dropped django 2.1 support
- removed the deprecated `django_zero_downtime_migrations_postgres_backend` module

- added python 3.8 support
- added support for postgres-specific indexes
- improved test clarity
- fixed regexp escaping warnings in the management command
- fixed style checks
- improved README
- marked python 3.5 support as deprecated
- marked postgres 9.4 support as deprecated
- marked django 2.0 support as deprecated
- marked django 2.1 support as deprecated