android 配置kotlin

app.buid  文件配置：
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'

implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"

Myapplication.build 配置：
ext.kotlin_version = '1.2.61'
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"