Postal-address

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* Add ``replace_city_name`` parameter to allow keeping the original value when normalizing.

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* Annotate code
* Be more permissive on dependencies versions

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* Migrate to Poetry for project management
* Use pytest-styled tests everywhere
* Format code with black and clean up the code
* Unpin pycountry and fix tests
* Drop support for Python 3.5 and under.
* Migrate CI to github workflows

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* Freeze pycountry version to ``18.5.26`` to avoid issues with subdivsion.

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* Unfreeze pycountry version and bump to ``pycountry >= 18.5.26``.
* Refactor country aliases with better categories.
* Some subdivisions names were updated, such as ``FR-O`` to ``FR-HDF``.
* Drop support for Python 3.3.

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* Exclude production of invalid random addresses in ``ar_PS`` locale. See 20.
* Bump dependency to ``Faker >= 0.8.4``.