Bump contextlib2 from 0.6.0 to 21.6.0

[dependabot]

Bumps contextlib2 from 0.6.0 to 21.6.0.

Changelog

Sourced from contextlib2's changelog.

21.6.0 (2021-06-27) ^^^^^^^^^^^^^^^^^^^

• License update: due to the inclusion of type hints from the typeshed project, the contextlib2 project is now under a combination of the Python Software License (existing license) and the Apache License 2.0 (typeshed license)

• Switched to calendar based versioning using a "year"-"month"-"serial" scheme, rather than continuing with pre-1.0 semantic versioning

• Due to the inclusion of asynchronous features from Python 3.7+, the minimum supported Python version is now Python 3.6 ([#29](https://github.com/jazzband/contextlib2/issues/29) <https://github.com/jazzband/contextlib2/issues/29>__)

• Synchronised with the Python 3.10 version of contextlib ([#12](https://github.com/jazzband/contextlib2/issues/12) <https://github.com/jazzband/contextlib2/issues/12>__), making the following new features available on Python 3.6+:

  • asyncontextmanager (added in Python 3.7, enhanced in Python 3.10)
  • aclosing (added in Python 3.10)
  • AbstractAsyncContextManager (added in Python 3.7)
  • AsyncContextDecorator (added in Python 3.10)
  • AsyncExitStack (added in Python 3.7)
  • async support in nullcontext (Python 3.10)

• contextlib2 now includes an adapted copy of the contextlib type hints from typeshed (the adaptation removes the Python version dependencies from the API definition) ([#33](https://github.com/jazzband/contextlib2/issues/33) <https://github.com/jazzband/contextlib2/issues/33>__)

• to incorporate the type hints stub file and the py.typed marker file, contextlib2 is now installed as a package rather than as a module

• Updates to the default compatibility testing matrix:

  • Added: CPython 3.9, CPython 3.10
  • Dropped: CPython 2.7, CPython 3.5, PyPy2

0.6.0.post1 (2019-10-10) ^^^^^^^^^^^^^^^^^^^^^^^^

• Issue [#24](https://github.com/jazzband/contextlib2/issues/24) <https://github.com/jazzband/contextlib2/issues/24>__: Correctly update NEWS.rst for the 0.6.0 release.

Commits

• 94174ba Merge pull request #38 from ncoghlan/issue-37-mypy-stubtest
• fffe1d9 Fix mypy.stubtest invocation
• 9a1453b Issue #37: Use mypy.stubcheck to validate stub file
• 190f6af Merge pull request #36 from ncoghlan/remove-lingering-py2-mentions
• 181b9c2 Remove lingering Python 2 mention
• bed62be Merge pull request #34 from ncoghlan/issue-33-add-type-hinting-support
• 4b353b9 Update NEWS file
• 0fb391a Actually run a typecheck in CI
• 841d0ae Include the pyi patch file
• 3f6ee4d Merge remote-tracking branch 'origin/master' into issue-33-add-type-hinting-s...
• Additional commits viewable in compare view

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