add 3 more missing countries

[le-cong]

  {
    name: 'Antarctica',
    alpha2: 'AQ',
    alpha3: 'ATA',
    numeric: '010',
    currencyCodes: ['USD'],
  },
  {
    name: 'Falkland Islands (the) [Malvinas]',
    alpha2: 'FK',
    alpha3: 'FLK',
    numeric: '238',
    currencyCodes: ['FKP'],
  },
  {
    name: 'South Georgia and the South Sandwich Islands',
    alpha2: 'GS',
    alpha3: 'SGS',
    numeric: '239',
    currencyCodes: ['GBP'],
  },

[carlansley]

@le-cong do you know when these were added to ISO 3166?

[le-cong]

i don't know exactly. according to chatgpt:

Below is a summary based on the historical records of the ISO 3166‑1 standard:
	•	Antarctica (code AQ):
Antarctica appeared in the very first edition of ISO 3166‑1, which was published in 1974.
	•	Falkland Islands (the) [Malvinas] (code FK):
The Falkland Islands were also part of that initial ISO 3166‑1 publication in 1974.
	•	South Georgia and the South Sandwich Islands (code GS):
This territory was not given its own entry in the original 1974 edition. It was later added—its current ISO 3166‑1 code (GS) was officially assigned in 1985.

but maybe only paid member can view the details of those archives to 100% verify?