Inflect

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* 147: Enhanced type annotations.

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* 133: Add a ``py.typed`` file so mypy recognizes type annotations.
* Misc fixes in 128, 134, 135, 137, 138, 139, 140, 142,
143, 144.
* Require Python 3.7 or later.

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* 108: Add support for pluralizing open compound nouns.

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* 121: Modernized the codebase. Added a lot of type annotations.

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* 113: Add support for uncountable nouns.

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* Refreshed package metadata.