Upgrade Android Dependencies. Remove references to jCenter

android/app/build.gradle

@@ -89,7 +89,8 @@ dependencies {
     implementation project(':cwtch')
     implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.2"
     implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.2"
-    implementation "com.airbnb.android:lottie:3.5.0"
+    implementation "com.airbnb.android:lottie:4.2.1"
+    implementation "androidx.localbroadcastmanager:localbroadcastmanager:1.0.0"
     implementation "com.android.support.constraint:constraint-layout:2.0.4"
 
     // WorkManager

android/build.gradle

@@ -2,7 +2,8 @@ buildscript {
     ext.kotlin_version = '1.3.50'
     repositories {
         google()
-        jcenter()
+        // jCenter() no longer exists... https://blog.gradle.org/jcenter-shutdown
+        mavenCentral()
     }
 
     dependencies {
@@ -15,7 +16,7 @@ buildscript {
 allprojects {
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
 }