Keyring

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* Require Python 3.6 or later.

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* 417: Fix TypeError when backend fails to initialize.

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* Extracted ``keyring.testing`` package to contain supporting
functionality for plugin backends. ``keyring.tests`` has been
removed from the package.

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* Switch to `importlib.metadata
<https://docs.python.org/3/library/importlib.metadata.html>`_
for loading entry points. Removes one dependency on Python 3.8.

* Added new ``KeyringBackend.set_properties_from_env``.

* 382: Add support for alternate persistence scopes for Windows
backend. Set ``.persist`` to "local machine" or "session"
to enable the alternate scopes or "enterprise" to use the
default scope.

* 404: Improve import times when a backend is specifically
configured by lazily calling ``get_all_keyring``.

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* Add support for get_credential() with the SecretService backend.

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* 369: macOS Keyring now honors a ``KEYCHAIN_PATH``
environment variable. If set, Keyring will use that
keychain instead of the default.