Update README for Androidx

Change-Id: I1f61650dfa9b2754ff1cf1d96be6cf4f9cb4bd13

Author: samtstern

README.md

@@ -105,45 +105,46 @@ You can see the specific dependencies associated with each release on the
 If you would like to use a newer version of one of FirebaseUI's transitive dependencies, such
 as Firebase, Play services, or the Android support libraries, you need to add explicit
 `implementation` declarations in your `build.gradle` for all of FirebaseUI's dependencies at the version
-you want to use. For example if you want to use Play services/Firebase version `FOO` and support
-libraries version `BAR` add the following extra lines for each FirebaseUI module you're using:
+you want to use. Here are some examples listing all of the critical dependencies:
 
 #### Auth
 
 ```groovy
-implementation "com.google.firebase:firebase-auth:$FOO"
-implementation "com.google.android.gms:play-services-auth:$FOO"
-
-implementation "com.android.support:design:$BAR"
-implementation "com.android.support:customtabs:$BAR"
-implementation "com.android.support:cardview-v7:$BAR"
+implementation "com.google.firebase:firebase-auth:$X.Y.Z"
+implementation "com.google.android.gms:play-services-auth:$X.Y.Z"
+
+implementation "android.arch.lifecycle:extensions:$X.Y.Z"
+implementation "androidx.browser:browser:$X.Y.Z"
+implementation "androidx.cardview:cardview:$X.Y.Z"
+implementation "androidx.constraintlayout:constraintlayout:$X.Y.Z"
+implementation "androidx.legacy:legacy-support-v4:$X.Y.Z"
+implementation "com.google.android.material:material:$X.Y.Z"
 ```
 
 #### Firestore
 
 ```groovy
-implementation "com.google.firebase:firebase-firestore:$FOO"
+implementation "com.google.firebase:firebase-firestore:$X.Y.Z"
 
-implementation "com.android.support:recyclerview-v7:$BAR"
-implementation "com.android.support:support-v4:$BAR"
+implementation "androidx.legacy:legacy-support-v4:$X.Y.Z"
+implementation "androidx.recyclerview:recyclerview:$X.Y.Z"
 ```
 
 #### Realtime Database
 
 ```groovy
-implementation "com.google.firebase:firebase-database:$FOO"
+implementation "com.google.firebase:firebase-database:$X.Y.Z"
 
-implementation "com.android.support:recyclerview-v7:$BAR"
-implementation "com.android.support:support-v4:$BAR"
+implementation "androidx.legacy:legacy-support-v4:$X.Y.Z"
+implementation "androidx.recyclerview:recyclerview:$X.Y.Z"
 ```
 
 #### Storage
 
 ```groovy
-implementation "com.google.firebase:firebase-storage:$FOO"
+implementation "com.google.firebase:firebase-storage:$X.Y.Z"
 
-implementation "com.android.support:appcompat-v7:$BAR"
-implementation "com.android.support:palette-v7:$BAR"
+implementation "androidx.legacy:legacy-support-v4:$X.Y.Z"
 ```
 
 
@@ -189,7 +190,7 @@ repositories {
 Then you can depend on snapshot versions:
 
 ```groovy
-implementation 'com.firebaseui:firebase-ui-auth:x.y.z-SNAPSHOT'
+implementation 'com.firebaseui:firebase-ui-auth:$X.Y.Z-SNAPSHOT'
 ```
 
 You can see which `SNAPSHOT` builds are avaiable here: