2022.1.7 🥳

Claudio Jolowicz, Diego Ramirez, and Tom Fleet have become maintainers of Nox. We'd like to thank the following folks who contributed to this release:

• @brettcannon
• @cjolowicz
• @dhermes
• @DiddiLeija
• @FollowTheProcess
• @franekmagiera
• @henryiii
• @jugmac00
• @maciej-lech
• @nawatts
• @Tolker-KU

New features:

• Add mamba backend (#444, #448, #546, #551)
• Add session.debug to show debug-level messages (#489)
• Add cookbook page to the documentation (#483)
• Add support for the FORCE_COLOR environment variable (#524, #548)
• Allow using session.chdir() as a context manager (#543)
• Deprecate use of session.install() without a valid backend (#537)

Improvements:

• Test against Python 3.10 (#495, $502, #506)
• Add support for the channel option when using the conda backend (#522)
• Show more specific error message when the --keywords expression contains a syntax error (#493)
• Include reference to session.notify() in tutorial page (#500)
• Document how session.run() fails and how to handle failures (#533)
• Allow the list of sessions to be empty (#523)

Bugfixes:

• Fix broken temporary directory when using session.chdir() (#555, #556)
• Set the CONDA_PREFIX environment variable (#538)
• Fix bin directory for the conda backend on Windows (#535)

Internal changes:

• Replace deprecated load_module with exec_module (#498)
• Include tests with source distributions (#552)
• Add missing copyright notices (#509)
• Use the new ReadTheDocs configurations (#527)
• Bump the Python version used by ReadTheDocs to 3.8 (#496)
• Improve the Sphinx config file (#499)
• Update all linter versions (#528)
• Add pre-commit and new checks (#530, #539)
• Check MANIFEST.in during CI (#552)
• Remove redundant LICENSE from MANIFEST.in (#505)
• Make setuptools use the standard library's distutils to work around virtualenv bug. (#547, #549)
• Use shlex.join() when logging a command (#490)
• Use shutil.rmtree() over shelling out to rm -rf in noxfile (#519)
• Fix missing Python 3.9 CI session (#529)
• Unpin docs session and add --error-on-missing-interpreter to CI (#532)
• Enable color output from Nox, pytest, and pre-commit during CI (#542)
• Only run conda_tests session by default if user has conda installed (#521)
• Update dependencies in requirements-conda-test.txt (#536)