Roman

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- expanded test coverage

- Added support for 0 -> N
(see https://en.wikipedia.org/wiki/Roman_numerals#Zero)

- Added support for Python 3.8

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- Added support for Python 3.7.

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- Added support for Python 3.5, 3.6 and PyPy3.

- Dropped support for Python 2.6 and 3.3.

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- Added Python 3.3 and PyPy support.

- Added tests.

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- Initial PyPI release.