adds missing ISO information for some countries

[moimikey]

notes

• this adds some missing ISO codes for v2 release - Country rebuild - ISOs missing, countries not accurate #19
• the british virgin islands ISO needs to be edited. It's not actually correct... will probably wanna edit that later.
• removed Yugoslavia, as it's not a country anymore
• individual json files for "regions" aren't so uniform. Like wales.json had the correct information, but lacked the GBR ISO codes. ditto for some other UK regions.

I do thing the DB needs to be rebuilt though. theres some discrepancies here and there. FWIW, https://github.com/OpenBookPrices/country-data has raw csv and json that could be used.

[therebelrobot]

Downloaded it, ran tests, and in my professional opinion:

[moimikey]

totally stealing that gif