Bump django-treebeard from 4.3 to 4.3.1

[dependabot-preview]

Bumps django-treebeard from 4.3 to 4.3.1.

Changelog

Sourced from django-treebeard's changelog.

Release 4.3.1 (Dec 25, 2019)

• Added check to avoid unnecessary database query for MP_Node.get_ancestors() if the node is a root node.
• Drop support for Python-3.4.
• Play more nicely with other form classes, that implement __init__(self, *args, **kwargs), e.g. django-parler's TranslatableModelForm, where kwargs.get('instance') is None when called from here.
• Sorting on path on necessary queries, fixes some issues and stabilizes the whole MP section.
• Add German translation strings.

Commits

• 187a37c attempt with comment on #139 by @rvanlaar
• 2f38f3c downgrade to Postgres-10
• b85b7ef Install Postgres packages
• 29db8ae add block ‘services’ to Travis CI
• 7afef22 Drop Django<1.11, add Django>2.0,<3.0 from testing matrix
• 3a8062c Bump to version 4.3.1
• 8042ee9 Merge pull request #136 from thejcannon/master
• 8b2a8b5 Fix a couple more typos
• 86fae6c Fix a couple of typos
• 13c6932 Merge pull request #133 from solarissmoke/patch-1
• Additional commits viewable in compare view

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[codecov]

Codecov Report

Merging #219 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #219   +/-   ##
=======================================
  Coverage   52.46%   52.46%           
=======================================
  Files          30       30           
  Lines        1765     1765           
=======================================
  Hits          926      926           
  Misses        839      839

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Superseded by #299.