Update build.gradle

Author: samtstern

auth/app/build.gradle

@@ -21,18 +21,26 @@ android {
 }
 
 dependencies {
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.61"
+    
     implementation 'androidx.legacy:legacy-support-v4:1.0.0'
     implementation 'androidx.appcompat:appcompat:1.1.0'
     implementation 'androidx.browser:browser:1.0.0'
     implementation 'androidx.cardview:cardview:1.0.0'
+    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
     implementation 'com.google.android.material:material:1.1.0'
 
     implementation "com.google.firebase:firebase-auth:19.2.0"
-    implementation "com.firebaseui:firebase-ui-auth:4.3.2"
+    
+    // [START gradle_firebase_ui_auth]
+    implementation "com.firebaseui:firebase-ui-auth:6.2.0"
+
+    // Required only if Facebook login support is required
+    // Find the latest Facebook SDK releases here: https://goo.gl/Ce5L94
     implementation "com.facebook.android:facebook-android-sdk:4.42.0"
-    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.61"
-    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+    // [END gradle_firebase_ui_auth]
 }
+
 repositories {
     mavenCentral()
 }