Merge 6.31.1 (#6376)

Author: paulb777

Firebase.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name             = 'Firebase'
-  s.version          = '6.31.0'
+  s.version          = '6.31.1'
   s.summary          = 'Firebase'
 
   s.description      = <<-DESC
@@ -73,7 +73,7 @@ Simplify your app development, grow your user base, and monetize more effectivel
 
   s.subspec 'AppDistribution' do |ss|
     ss.dependency 'Firebase/CoreOnly'
-    ss.ios.dependency 'FirebaseAppDistribution', '~> 0.9.0'
+    ss.ios.dependency 'FirebaseAppDistribution', '~> 0.9.1'
     ss.ios.deployment_target = '9.0'
   end
 

FirebaseCore/CHANGELOG.md

@@ -1,8 +1,7 @@
-# Unreleased
+# Firebase 6.31.1
 - [fixed] Sporadic missing FirebaseApp symbol build issue introduced in Firebase 6.28.0. (#6341)
 
-
-# v6.10.1 -- M78
+# Firebase 6.31.0 FirebaseCore 6.10.1 -- M78
 - [added] Beta release of Swift Package Manager. Details
   [here](https://github.com/firebase/firebase-ios-sdk/blob/master/SwiftPackageManager.md). (#3136)
 - [changed] Firebase's dependencies on nanopb are updated from version 0.3.9.5 to