add continents

[schoenbergerb]

Hi,

while working on a new feature, I ran into a scenario where filtering countries by continent was essential. To address this need, I've updated the ISO3166 dataset by adding a continent field to every country. This change allows for more precise geographical grouping without affecting existing functionality.

I hope makes sense from your perspective ✌️

[codecov-commenter]

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Additional details and impacted files

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  Coverage        ?   100.00%           
  Complexity      ?        39           
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  Files           ?         4           
  Lines           ?       100           
  Branches        ?         0           
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  Hits            ?       100           
  Misses          ?         0           
  Partials        ?         0           

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[alcohol]

Should this not take into account that there are several countries that actually span multiple continents? Such as Russia, Turkey, etc?