Update isort to 4.3.12

[pyup-bot]

This PR updates isort from 4.3.9 to 4.3.12.

Changelog

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

Links

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

[codecov]

Codecov Report

Merging #590 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #590   +/-   ##
=======================================
  Coverage   95.65%   95.65%           
=======================================
  Files          55       55           
  Lines        2856     2856           
=======================================
  Hits         2732     2732           
  Misses        124      124

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