Update isort to 4.3.21

[pyup-bot]

This PR updates isort from 4.3.4 to 4.3.21.

Changelog

4.3.21

- Fixed issue 957 - Long aliases and use_parentheses generates invalid syntax

4.3.20

- Fixed issue 948 - Pipe redirection broken on Python2.7

4.3.19

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

4.3.18

- 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

4.3.17

- Fixed issue 905 & 919: Import section headers behaving strangely

4.3.16

- 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.

4.3.15

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

4.3.14

- Fixed a regression with */directory/*.py style patterns

4.3.13

- 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.

4.3.12

- Fix error caused when virtual environment not detected

4.3.11

- 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

4.3.10

- 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

4.3.9

- Fixed a bug that led to an incompatibility with black: 831

4.3.8

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

4.3.7

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

4.3.6

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

4.3.5 - February 24, 2019 - last Python 2.7 Maintenance Release

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.

Links

• PyPI: https://pypi.org/project/isort
• Changelog: https://pyup.io/changelogs/isort/
• Repo: https://github.com/timothycrosley/isort

[coveralls]

Coverage decreased (-0.04%) to 99.961% when pulling d1e6576 on pyup-update-isort-4.3.4-to-4.3.21 into 13fbed9 on master.

[coveralls]

Coverage decreased (-0.05%) to 99.953% when pulling d1e6576 on pyup-update-isort-4.3.4-to-4.3.21 into 13fbed9 on master.