isort 5.2.0 on Python PyPI

Implemented #1335: Official API for diff capturing.
Implemented #1331: Warn when sections don't match up.
Implemented #1261: By popular demand, filter_files can now be set in the config option.
Implemented #960: Support for respecting git ignore via "--gitignore" or "skip_gitignore=True".
Implemented #727: Ability to only add imports if existing imports exist.
Implemented #970: Support for custom sharable isort profiles.
Implemented #1214: Added support for git_hook lazy option (Thanks @sztamas!)
Implemented #941: Added an additional multi_line_output mode for more compact formatting (Thanks @sztamas!)
Implemented #1020: Option for LOCALFOLDER.
Implemented #1353: Added support for output formatting plugins.
# isort: split can now be used at the end of an import line.
Fixed #1339: Extra indent is not preserved when isort:skip is used in nested imports.
Fixed #1348: --diff works incorrectly with files that have CRLF line endings.
Improved code repositories usage of pylint tags (#1350).