Keyring

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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.

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* Refresh package skeleton.
* Adopt `black <https://pypi.org/project/black>`_ code style.

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* Merge with 18.0.1.

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* 383: Drop support for EOL Python 2.7 - 3.4.

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* 386: ExceptionInfo no longer retains a reference to the
traceback.

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* 375: On macOS, the backend now raises a ``KeyringLocked``
when access to the keyring is denied (on get or set) instead
of ``PasswordSetError`` or ``KeyringError``. Any API users
may need to account for this change, probably by catching
the parent ``KeyringError``.
Additionally, the error message from the underlying error is
now included in any errors that occur.