Pyptax

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- Add resource to provide historical bid and ask rates for a requested time period.
- Add resource to provide intermediary rates for a requested date.
- Rename `CloseReport` to `Bulletin` and define its type on the internal attribute `bulletin_type`.
- Remove string conversion on bid and ask rates retrieved.
- Fix development installation docs.

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- Add Command line interface.
- Improve exceptions handling.

- Add ``ClientException`` to deal with response error.
- Add ``UnavailableDataError`` to handle empty data returned.

- Add ``Close.display`` method to show data as a fixed width table for pretty printing.

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- ``ptax.close`` requires date in the format YYYY-MM-DD
- Requires Python 3.7 or later
- Add documentation to readthedocs https://pyptax.readthedocs.io/.

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- ``ptax.close`` returns an instance of the ``CloseReport`` model instead of a dict.

Before:

>>> from pyptax import ptax
>>> ptax.close('01-20-2020')
>>> {'datetime': '2020-01-20 13:09:02.871', 'bid': '4.1823', 'ask': '4.1829'}

After:

>>> from pyptax import ptax
>>> ptax.close('01-20-2020')
>>> CloseReport(datetime='2020-01-20 13:09:02.871', bid='4.1823', ask='4.1829')
>>> ptax.close('01-20-2020').as_dict
>>> {'datetime': '2020-01-20 13:09:02.871', 'bid': '4.1823', 'ask': '4.1829'}

- Create a client to deal with service request to add support for new features.
- Add PyPI publish commands.
- Fix typo in documentation

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- First public release.