Update dependency isort to v4.3.21

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
isort (source, changelog)	==4.3.4 -> ==4.3.21

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Release Notes

pycqa/isort

v4.3.21

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• Fixed issue #​957 - Long aliases and use_parentheses generates invalid syntax

v4.3.20

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• Fixed issue #​948 - Pipe redirection broken on Python2.7

v4.3.19

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• Fixed issue #​942 - correctly handle pyi (Python Template Files) to match black output

v4.3.18

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• Fixed an issue with parsing files that contain unicode characters in Python 2
• Fixed issue #​924 - Pulling in pip internals causes depreciation warning
• Fixed issue #​938 - Providing a way to filter explicitly passed in files via configuration settings (--filter-files)
• Improved interoperability with toml configuration files

v4.3.17

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• Fixed issue #​905 & #​919: Import section headers behaving strangely

v4.3.16

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• Fixed issue #​909 - skip and skip-glob are not enforced when using settings-path.
• Fixed issue #​907 - appdirs optional requirement does not correctly specify version
• Fixed issue #​902 - Too broad warning about missing toml package
• Fixed issue #​778 - remove user from known standard library as it's no longer in any supported Python version.

v4.3.15

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• Fixed a regression with handling streaming input from pipes (Issue #​895)
• Fixed handling of \x0c whitespace character (Issue #​811)
• Improved CLI documentation

v4.3.14

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• Fixed a regression with /directory/.py style patterns

v4.3.13

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• Fixed the inability to accurately determine import section when a mix of conda and virtual environments are used.
• Fixed some output being printed even when --quiet mode is enabled.
• Fixed issue #​890 interoperability with PyCharm by allowing case sensitive non type grouped sorting.
• Fixed issue #​889 under some circumstances isort will incorrectly add a new line at the beginning of a file.
• Fixed issue #​885 many files not being skipped according to set skip settings.
• Fixed issue #​842 streaming encoding improvements.

v4.3.12

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• Fix error caused when virtual environment not detected

v4.3.11

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• Fixed issue #​876: confused by symlinks pointing to virtualenv gives FIRSTPARTY not THIRDPARTY
• Fixed issue #​873: current version skips every file on travis
• Additional caching to reduce performance regression introduced in 4.3.5

v4.3.10

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• Fixed Windows incompatibilities (Issue #​835)
• Fixed relative import sorting bug (Issue #​417)
• Fixed "no_lines_before" to also be respected from previous empty sections.
• Fixed slow-down introduced by finders mechanism by adding a LRU cache (issue #​848)
• Fixed issue #​842 default encoding not-set in Python2
• Restored Windows automated testing
• Added Mac automated testing

v4.3.9

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• Fixed a bug that led to an incompatibility with black: #​831

v4.3.8

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• Fixed a bug that led to the recursive option not always been available from the command line.

v4.3.7

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• Expands the finder failsafe to occur on the creation of the finder objects.

v4.3.6

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• Fixes a fatal error that occurs if a single finder throws an exception. Important as we add more finders that utilize third party libraries.

v4.3.5

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This is the final Python 2.x release of isort, and includes the following major changes:

Potentially Interface Breaking:

• The -r option for removing imports has been renamed -rm to avoid accidental deletions and confusion with the -rc recursive option.
• __init__.py has been removed from the default ignore list. The default ignore list is now empty - with all items needing to be explicitly ignored.
• Isort will now by default ignore .tox / venv folders in an effort to be "safe". You can disable this behaviour by setting the "--unsafe" flag, this is separate from any skip or not skip rules you may have in place.
• Isort now allows for files missing closing newlines in whitespace check
• distutils support has been removed to simplify setup.py

New:

• Official Python 3.7 Compatibility.
• Support for using requirements files to auto determine third-paty section if pipreqs & requirementslib are installed.
• Added support for using pyproject.toml if toml is installed.
• Added support for XDG_HOME if appdirs is installed.
• An option has been added to enable ignoring trailing comments ('ignore_comments') defaulting to False.
• Added support to enable line length sorting for only specific sections
• Added a correctly_sorted property on the SortsImport to enable more intuitive programmatic checking.

Fixes:

• Improved black compatibility.
• Isort will now detect files in the CWD as first-party.
• Fixed several cases where '-ns' or 'not_skip' was being incorrectly ignored.
• Fixed sorting of relative path imports ('.', '..', '...', etc).
• Fixed bugs caused by a failure to maintain order when loading iterables from config files.
• Correctly handle CPython compiled imports and others that need EXT_SUFFIX to correctly identify.
• Fixed handling of Symbolic Links to follow them when walking the path.
• Fixed handling of relative known_paths.
• Fixed lack of access to all wrap modes from the CLI.
• Fixed handling of FIFO files.
• Fixed a bug that could result in multiple imports being inserted on the same line.

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