Release v7.1.2

[lildude]

A small quick patch release to update the Kotlin grammar to address the request in #4329 and fix Kotlin syntax highlighting.

Once deployed on GitHub.com, this will render correctly:

class PostalAddress(
  val streetAddress : String,
  val city : String,
  val zip : String,
  val state : USState?,
  val country : Country
) {
   assert {(state == null) xor (country == Countries["US"]) }
}

class PhoneNumber(
  val country : Country,
  val areaCode : Int,
  val number : Long
)

Fixes #4329

/cc @nishtahir @DanielJette

[lildude]

This release is now live on GitHub.com and the sample in the OP is now rendering correctly.