Openai-cli

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* Allow overriding API URL through ``OPENAI_API_URL`` environment variable.
Thanks to `Stefano d'Antonio`_, `Issue 5`, `PR 6`_.

.. _`Stefano d'Antonio`: https://github.com/UnoSD
.. _`Issue 5`: https://github.com/peterdemin/openai-cli/issues/5
.. _`PR 6`: https://github.com/peterdemin/openai-cli/pull/6

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* Add command line option -m/--model. Thanks to `Alex Zhuang`_, `PR 1`_.

.. _`Alex Zhuang`: https://github.com/azhx
.. _`PR 1`: https://github.com/peterdemin/openai-cli/pull/1

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* Initial release