Use Kotlin Triple over data class

[russellbanks]

In Kotlin, a Tuple is called a Triple. There's no need for a custom data class here. Also, the use of semicolons here seems to be a typo.

Before:

// Kotlin doesn't have tuples, use data classes
data class GasPrices(val a: Double, val b: Double, val c: Double)

fun getGasPrices() = GasPrices(3.59, 3.69, 3.79)

val prices = getGasPrices();

val (a, b, c) = getGasPrices();

After:

fun getGasPrices() = Triple(3.59, 3.69, 3.79)

val prices = getGasPrices()

val (a, b, c) = getGasPrices()

[ttu]

Thanks! We could add more Tuple examples, that utilize Kotlin's predefined classes. 1 example could have a tuple with 2 elements (Pair), 1 with 3 elements (Triple) and last with 4(+) elements (data class). Would you like to make Kotlin changes to this PR and I can make C# changes to another PR?