Update Kotlin plugin and build scripts

Author: friederbluemle

build.gradle

@@ -14,29 +14,22 @@
 * limitations under the License.
 */
 
-// Top-level build file where you can add configuration options common to
-// all sub-projects/modules.
-
 buildscript {
     ext {
         app_compat_version = '1.1.0'
         constraint_layout_version = '1.1.3'
-        kotlin_version = '1.3.50'
+        kotlin_version = '1.3.72'
         leanback_version = '1.1.0-alpha02'
         material_version = '1.1.0-alpha10'
         support_lib_version = '1.0.0-beta01'
     }
-
     repositories {
         google()
         jcenter()
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:3.6.3'
         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
     }
 }
 
@@ -46,3 +39,7 @@ allprojects {
         jcenter()
     }
 }
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}

mediacontroller/build.gradle

@@ -20,40 +20,33 @@ apply plugin: 'kotlin-android-extensions'
 
 android {
     compileSdkVersion 28
-
-    compileOptions {
-        sourceCompatibility JavaVersion.VERSION_1_8
-        targetCompatibility JavaVersion.VERSION_1_8
-    }
-
     defaultConfig {
         applicationId "com.example.android.mediacontroller"
         minSdkVersion 21
         targetSdkVersion 28
         versionCode 1
         versionName "1.0"
-
         vectorDrawables.useSupportLibrary = true
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
-
     }
     buildTypes {
         release {
             minifyEnabled false
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
 }
 
 dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
-
     implementation "androidx.appcompat:appcompat:$app_compat_version"
     implementation "androidx.constraintlayout:constraintlayout:$constraint_layout_version"
     implementation "androidx.cardview:cardview:$support_lib_version"
-    implementation 'com.android.support:design:28.0.0'
-
     implementation "androidx.leanback:leanback:$leanback_version"
-
+    implementation 'com.android.support:design:28.0.0'
     implementation "com.google.android.material:material:$material_version"
 }

settings.gradle

@@ -1 +1,2 @@
+rootProject.name='android-media-controller'
 include ':mediacontroller'