Update Gradle and introduce Kotlin

app/build.gradle

@@ -1,4 +1,7 @@
 apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
+apply plugin: 'kotlin-kapt'
 
 android {
     compileSdkVersion 28
@@ -53,6 +56,8 @@ ext {
 }
 
 dependencies {
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+
     androidTestImplementation('androidx.test.espresso:espresso-core:3.1.0', {
         exclude module: 'support-annotations'
     })
@@ -92,10 +97,10 @@ dependencies {
 
     implementation "androidx.room:room-runtime:${roomDbLibVersion}"
     implementation "androidx.room:room-rxjava2:${roomDbLibVersion}"
-    annotationProcessor "androidx.room:room-compiler:${roomDbLibVersion}"
+    kapt "androidx.room:room-compiler:${roomDbLibVersion}"
 
     implementation "frankiesardo:icepick:${icepickLibVersion}"
-    annotationProcessor "frankiesardo:icepick-processor:${icepickLibVersion}"
+    kapt "frankiesardo:icepick-processor:${icepickLibVersion}"
 
     debugImplementation "com.squareup.leakcanary:leakcanary-android:${leakCanaryLibVersion}"
     releaseImplementation "com.squareup.leakcanary:leakcanary-android-no-op:${leakCanaryLibVersion}"

build.gradle

@@ -1,12 +1,14 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
+    ext.kotlin_version = '1.3.50'
     repositories {
         jcenter()
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.4.0'
+        classpath 'com.android.tools.build:gradle:3.5.1'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,5 @@
-#Mon Oct 07 06:29:33 CEST 2019
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.1.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip