CountryCode update + Kotlin & Compose

[GuilhE]

sealed class CountryData(
    val countryNameResId: Int,
    val flagResId: Int,
    val countryCode: String,
    val iso2Code: String,
    val iso3Code: String
) {

   val countryCodeWithPrefix: String = "+$countryCode"
    ...
}

#4 (comment)

Plus, compose, kotlin, gradle, targetSdk update