Customize country codes of CountryPicker

[jhihruei]

Sometimes we will not support all of the countries.
I would like to make options of country list could be customized,
I think we can do:

1. Add property to enable/disable specify countries by isoCountryCode or CallingCode
2. Add property to override default country codes

In my opinion, I prefer to override default country codes.
I think enable/disable specify countries will be a bit complex for the setting, override default country codes could be more flexible and easier to use.

So I would like to do:

• Rename countryCodes to defaultCountryCodes (the country codes array)
• Add a property countryCodes: Country[] to CountryPickerProps
• Modify countryCode related function to use
  const countryCodes: Country[] = this.props.countryCodes || defaultCountryCodes

Any thoughts?

[louischan-oursky]

Agree with you that the second option is better.

The new prop countryCodes should be a default prop with the default value defaultCountryCodes.

Looking forwarding to seeing your contribution!