create column with default rework, expicit constraints drop before drop table and column and bug fixes

• changed ADD COLUMN DEFAULT NULL to safe operation for code default
• changed ADD COLUMN DEFAULT NOT NULL to safe operation for db_default in django 5.0+
• added ZERO_DOWNTIME_MIGRATIONS_KEEP_DEFAULT settings and changed ADD COLUMN DEFAULT NOT NULL with this settings to safe operation for django<5.0
• added ZERO_DOWNTIME_MIGRATIONS_EXPLICIT_CONSTRAINTS_DROP settings and added dropping constraints and indexes before drop column or table
• fixed sqlmigrate in idempotent mode
• fixed creation unique constraint with include parameter
• fixed idempotent mode tests
• updated unsafe migrations links to documentation
• updated patched code to latest django version
• updated test image to ubuntu 24.04
• improved README

dempotent mode, fix django 3.2 degradation

• added idempotent mode and ZERO_DOWNTIME_MIGRATIONS_IDEMPOTENT_SQL setting
• fixed django 3.2 degradation with missing skip_default_on_alter method
• improved readme
• updated release github action

python 3.12, django 5.0, postgres 16 support and deffered sql fix

• fixed deferred sql errors
• added django 5.0 support
• added python 3.12 support
• added postgres 16 support
• drop postgres 11 support
• drop ZERO_DOWNTIME_MIGRATIONS_USE_NOT_NULL setting
• marked migrate_isnotnull_check_constraints command deprecated

django 4.2 support

• added django 4.2 support
• marked django 3.2 support deprecated
• marked django 4.0 support deprecated
• marked django 4.1 support deprecated
• marked postgres 11 support deprecated
• drop postgres 10 support
• updated test docker image to ubuntu 22.04

python 3.11, django 4.1, postgres 15 support and AutoField fiexes

• added serial and integer, bigserial and bigint, smallserial and smallint, same types changes as safe migrations
• fixed AutoField type changing and concurrent insertions issue for django<4.1
• added sequence dropping and creation timeouts as they can be used with CASCADE keyword and affect other tables
• added django 4.1 support
• added python 3.11 support
• added postgres 15 support
• marked postgres 10 support deprecated
• drop django 2.2 support
• drop django 3.0 support
• drop django 3.1 support
• drop postgres 9.5 support
• drop postgres 9.6 support
• add github actions checks for pull requests

python 3.9, 3.10, django 3.2, 4.0, postgres 14 support and bug fix

• fixed rename model with keeping db_table raises 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

django 3.1 and postgres 13 support

• added django 3.1 support
• added postgres 13 support
• drop python 3.5 support
• updated test environment

bug fixes

• fixed decimal to float migration error
• fixed django 3.0.2+ tests

django 3.0 support

• added django 3.0 support
• added concurrently index creation and removal operations
• added exclude constraint support as unsafe operation
• drop postgres 9.4 support
• drop django 2.0 support
• drop django 2.1 support
• drop deprecated django_zero_downtime_migrations_postgres_backend module

python 3.8 support

• added python 3.8 support
• added postgres specific indexes support
• improved tests clearness
• fixed regexp escaping warning for management command
• fixed style check
• improved README
• marked python 3.5 support deprecated
• marked postgres 9.4 support deprecated
• marked django 2.0 support deprecated
• marked django 2.1 support deprecated