Merge pull request #254 from firebase/am-messaging-flatbuffers

Add flatbuffers to the set of messaging dependencies

Author: a-maurice

release_build_files/Android/firebase_dependencies.gradle

@@ -32,7 +32,8 @@ def firebaseDependenciesMap = [
   'instance_id' : ['com.google.firebase:firebase-iid:21.0.0'],
   'messaging' : ['com.google.firebase.messaging.cpp:firebase_messaging_cpp@aar',
                  'com.google.firebase:firebase-messaging:21.0.0',
-                 'androidx.core:core:1.0.1'],
+                 'androidx.core:core:1.0.1',
+                 'com.google.flatbuffers:flatbuffers-java:1.9.0'],
   'performance' : ['com.google.firebase:firebase-perf:19.0.9'],
   'remote_config' : ['com.google.firebase:firebase-config:20.0.0',
                      'com.google.android.gms:play-services-base:17.5.0'],