Updated countries geo json#6

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Commits on Aug 10, 2018

Updated countries geo json, source: https://github.com/AshKyd/geojson-regions
Bosmagit
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Make use of ISO 3166-1 alpha-3 country code. Updated unit tests for missing countries in old geo json
Bosmagit
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Commits on Nov 30, 2018

Made properties nullable to prevent potential crashes
Bosmagit
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Commits on Apr 1, 2019

Add nullability annotations
iandundas
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