Log Message:
py-keyring: updated to 19.1.0

19.1.0
* macOS Keyring now honors a ``KEYCHAIN_PATH``
  environment variable. If set, Keyring will use that
  keychain instead of the default.

19.0.2
* Refresh package skeleton.
* Adopt `black <https://pypi.org/project/black>`_ code style.

19.0.1
* Merge with 18.0.1.

18.0.1
* ExceptionInfo no longer retains a reference to the
  traceback.