Update py-vdirsyncer to 0.8.1.

Version 0.8.1
=============

*released on 30 January 2016*

- Fix error messages when invalid parameter fetching strategy is used. This is
  important because users would receive awkward errors for using deprecated
  ``keyring`` fetching.

Version 0.8.0
=============

*released on 27 January 2016*

- Keyring support has been removed, which means that ``password.fetch =
  ["keyring", "example.com", "myuser"]`` doesn't work anymore.

  For existing setups: Use ``password.fetch = ["command", "keyring", "get",
  "example.com", "myuser"]`` instead, which is more generic. See the
  documentation for details.

- Now emitting a warning when running under Python 2. See :gh:`219`.

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