Converted the read json list Java file to Kotlin (#1495)

examples/build.gradle.kts

@@ -1,3 +1,5 @@
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
 plugins {
   kotlin("jvm")
   kotlin("kapt")
@@ -9,3 +11,11 @@ dependencies {
   implementation(project(":moshi"))
   implementation(project(":moshi-adapters"))
 }
+
+tasks.withType<KotlinCompile>().configureEach {
+  kotlinOptions {
+    freeCompilerArgs += listOf(
+      "-Xopt-in=kotlin.ExperimentalStdlibApi"
+    )
+  }
+}