5.5:
Django 3.0 compatibility.
Plugin system for extending the Country object.
5.4:
Renamed Macedonia -> North Macedonia.
Fix an outlying makemigrations error.
Pulled in new translations which were provided but missing from previous version.
Fixed Simplified Chinese translation (needed to be locale/zh_Hans).
Introduce an optional complex format for COUNTRIES_ONLY and COUNTRIES_OVERRIDE to allow for multiple names for a country, a custom three character code, and a custom numeric country code.
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