in src/main/scala/com/gu/fastly/api/FastlyApiClient.scala [117:120]
def versionClone(version: Int): Future[Response] = {
val apiUrl = s"$fastlyApiUrl/service/$serviceId/version/$version/clone"
AsyncHttpExecutor.execute(apiUrl, PUT, headers = commonHeaders ++ Map("Content-Type" -> "application/x-www-form-urlencoded"))
}