Add Kotlin dependency

build.gradle

@@ -1,5 +1,6 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 buildscript {
+    ext.kotlin_version = '1.3.11'
     repositories {
         jcenter()
         maven {
@@ -10,6 +11,7 @@ buildscript {
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:3.2.0'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }