Update build.gradle

persistence-realm/build.gradle

 apply plugin: 'com.android.library'
+apply plugin: 'kotlin-android'
 apply plugin: 'realm-android'
 apply plugin: 'com.jakewharton.hugo'
 apply plugin: 'me.tatarka.retrolambda'
@@ -9,6 +10,7 @@ buildscript {
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:2.3.3'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$rootProject.ext.kotlinVersion"
         classpath 'io.realm:realm-gradle-plugin:2.3.2'
         classpath 'me.tatarka:gradle-retrolambda:3.5.0'
         classpath 'me.tatarka.retrolambda.projectlombok:lombok.ast:0.2.3.a2'
@@ -46,6 +48,8 @@ dependencies {
     compile "com.android.support:appcompat-v7:$rootProject.ext.supportLibraryVersion"
     compile "com.android.support:design:$rootProject.ext.supportLibraryVersion"
 
+    compile "org.jetbrains.kotlin:kotlin-stdlib-jre7:$rootProject.ext.kotlinVersion"
+
     compile 'io.reactivex.rxjava2:rxjava:2.1.0'
     compile 'io.reactivex.rxjava2:rxandroid:2.0.1'