Adding flags for EEC country members

[hhamon]

Hello,

Thanks for this useful library.

As an improvement, would you consider it useful to also include extra flags for EEC members?

https://www.government.nl/topics/european-union/eu-eea-efta-and-schengen-area-countries

Cheers,

[alcohol]

While useful, this is probably best implemented as a layer/wrapper on top of the existing data.