Migrated the project to Kotlin

MaterialDialogLibrary/build.gradle

@@ -1,15 +1,17 @@
 apply plugin: 'com.android.library'
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
 apply plugin: 'com.github.dcendents.android-maven'
 apply plugin: "com.jfrog.bintray"
 
 version = "2.1"
 
 android {
-    compileSdkVersion 29
+    compileSdkVersion 30
 
     defaultConfig {
         minSdkVersion 19
-        targetSdkVersion 29
+        targetSdkVersion 30
         versionCode 1
         versionName version
 
@@ -28,19 +30,21 @@ android {
 
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
-    implementation 'androidx.appcompat:appcompat:1.1.0'
-    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+    implementation "androidx.core:core-ktx:1.3.1"
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    implementation 'androidx.appcompat:appcompat:1.2.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.0.1'
     implementation 'androidx.annotation:annotation:1.1.0'
 
     // Material Design Library
-    implementation 'com.google.android.material:material:1.0.0'
+    implementation 'com.google.android.material:material:1.2.1'
 
     // Lottie Animation Library
     implementation 'com.airbnb.android:lottie:3.3.0'
 
-    testImplementation 'junit:junit:4.12'
-    androidTestImplementation 'androidx.test:runner:1.2.0'
-    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
+    testImplementation 'junit:junit:4.13'
+    androidTestImplementation 'androidx.test:runner:1.3.0'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
 }
 ext {
     bintrayRepo = 'maven'
@@ -159,4 +163,7 @@ bintray {
 }
 apply plugin: 'com.android.library'
 apply plugin: 'com.github.dcendents.android-maven'
-apply plugin: 'com.jfrog.bintray'
+apply plugin: 'com.jfrog.bintray'
+repositories {
+    mavenCentral()
+}