Update isort to 4.3.13

[pyup-bot]

This PR updates isort from 4.3.12 to 4.3.13.

Changelog

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.

Links

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

[codecov]

Codecov Report

Merging #592 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #592   +/-   ##
=======================================
  Coverage   95.65%   95.65%           
=======================================
  Files          55       55           
  Lines        2856     2856           
=======================================
  Hits         2732     2732           
  Misses        124      124

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