Declare Kotlin version in Gradle build scripts

See https://github.com/gradle/kotlin-dsl/releases/tag/v0.12.0

Author: eriwen

kapt-example-app/build.gradle.kts

@@ -1,5 +1,5 @@
 plugins {
-    kotlin("jvm")
+    kotlin("jvm") version "1.1.3-2"
     kotlin("kapt")
     application
 }

kapt-example-core/build.gradle.kts

@@ -1,5 +1,5 @@
 plugins {
-    kotlin("jvm")
+    kotlin("jvm") version "1.1.3-2"
 }
 
 dependencies {

kapt-example-processor/build.gradle.kts

@@ -1,5 +1,5 @@
 plugins {
-    kotlin("jvm")
+    kotlin("jvm") version "1.1.3-2"
     kotlin("kapt")
 }