Bump tox from 3.19.0 to 3.21.1

[dependabot-preview]

Bumps tox from 3.19.0 to 3.21.1.

Changelog

Sourced from tox's changelog.

v3.21.1 (2021-01-13)

Bugfixes

• Fix regression that broke using install_command in config replacements - by jayvdb #1777
• Fix regression parsing posargs default containing colon. - by jayvdb #1785

Features

• Prevent .tox in envlist - by jayvdb #1684

Miscellaneous

• Enable building tox with setuptools_scm 4 and 5 by :user:hroncok #1799

v3.21.0 (2021-01-08)

Bugfixes

• Fix the false congratulations message that appears when a KeyboardInterrupt occurs during package installation. - by gnikonorov #1453
• Fix platform support for install_command. - by jayvdb #1464
• Fixed regression in v3.20.0 that caused escaped curly braces in setenv to break usage of the variable elsewhere in tox.ini. - by jayvdb #1690
• Prevent {} and require {: is only followed by }. - by jayvdb #1711
• Raise MissingSubstitution on access of broken ini setting. - by jayvdb #1716

Features

• Allow { and } in default of {env:key:default}. - by jayvdb #1502
• Allow {posargs} in setenv. - by jayvdb #1695
• Allow {/} to refer to os.sep. - by jayvdb #1700
• Make parsing [testenv] sections in setup.cfg official. - by mauvilsa #1727
• Relax importlib requirement to allow 3.0.0 or any newer version - by pkolbus #1763

Documentation

• Document more info about using platform setting. - by prakhargurunani #1144
• Replace indexserver in documentation with environment variables - by ziima. #1357
• Document that the passenv environment setting is case insensitive. - by gnikonorov #1534

v3.20.1 (2020-10-09)

Commits

• ffac605 release 3.21.1
• 4b44584 config: Prevent .tox in envlist
• ff4bd47 config: Revert removal of {packages}/{opts} hack
• c1c1c5b test_config: Add test for indirect install_command
• 3914667 Allow building with setuptools_scm 4 and 5
• 7f13cf6 config: Fix parsing posargs default with colon
• ad6ca10 Merge pull request #1775 from tox-dev/release-3.21.0
• 2cc64c1 release 3.21.0
• 49edaed Add instructions for choosing pip version (#1771)
• 91e180d Fix CI (#1774)
• Additional commits viewable in compare view

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[codecov]

Codecov Report

Merging #217 (79bf9bd) into master (967eb79) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #217   +/-   ##
=======================================
  Coverage   94.87%   94.87%           
=======================================
  Files           7        7           
  Lines         351      351           
=======================================
  Hits          333      333           
  Misses         18       18           

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[dependabot-preview]

Superseded by #218.