v18.6.0

* :issue:`1776` via :pr:`1851`: Add support for UTF-8 encoded attachment
  file names in ``Content-Disposition`` header via :rfc:`6266#appendix-D`.

v18.1.2

* Fixed :issue:`1377` via :pr:`1785`: Restore a native WSGI-less
  HTTP server support.
* :pr:`1769`: Reduce log level for non-error events in win32.py

v17.4.2

* Fixed :issue:`1377` by backporting :pr:`1785` via :pr:`1786`:
  Restore a native WSGI-less HTTP server support.

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