Update tox requirement from <3.18,>=3.1 to >=3.1,<3.20

[dependabot-preview[bot]]

Updates the requirements on tox to permit the latest version.

Changelog

Sourced from tox's changelog.

v3.19.0 (2020-08-06)

Bugfixes

• skip setup.cfg if it has no tox:tox namespace - by hroncok #1045

Features

• Implement support for building projects having 517#in-tree-build-backends backend-path setting -by webknjaz #1575
• Don't require a tox config file for tox --devenv - by hroncok #1643

Documentation

• Fixed grammar in top-level documentation - by tfurf #1631

v3.18.1 (2020-07-28)

Bugfixes

• Fix TypeError when using isolated_build with backends that are not submodules (e.g. maturin) #1629

v3.18.0 (2020-07-23)

Deprecations (removal in next major release)

• Add allowlist_externals alias to whitelist_externals (whitelist_externals is now deprecated). - by dajose #1491

v3.17.1 (2020-07-15)

Bugfixes

• Fix tests when the HOSTNAME environment variable is set, but empty string - by hroncok #1616

v3.17.0 (2020-07-14)

Features

• The long arguments --verbose and --quiet (rather than only their short forms, -v and -q) are now accepted. #1612

Commits

• 0c8c729 release 3.19.0
• 8317240 Allow to use --devenv without tox config (#1644)
• 6f5bee8 Do not use setup.cfg file that does not have tox:tox namespace (#1642)
• 9d01182 Fix :user: role syntax in the #1631 change note (#1637)
• 59766bb Docs grammar (#1631)
• 6c1c2fa Bump pre-commit
• ddfae2d Implement support for PEP517 backend-path setting (#1614)
• 268ca02 Merge pull request #1632 from tox-dev/release-3.18.1
• 594244a release 3.18.1
• f6e60fd Fix isolated build helper scripts (#1629)
• Additional commits viewable in compare view

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[codecov[bot]]

Codecov Report

Merging #142 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #142   +/-   ##
=======================================
  Coverage   88.68%   88.68%           
=======================================
  Files          12       12           
  Lines         486      486           
=======================================
  Hits          431      431           
  Misses         55       55           

[dependabot-preview[bot]]

Superseded by #150.