Mir-winenv

--------

Fixed
^^^^^

- Fixed ugly error when no command is supplied.

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Changed
^^^^^^^

- ``load`` and ``reset`` replaced with ``run``. Instead of printing
environment variables for a shell to evaluate, instead run a command
with the modified environment.
- Now requires Python 3.6.

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Added
^^^^^

- Added list command.
- Added support for fish and shell selection.

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Initial release.