Backups.proto updated by Signal-Android

[lapseofreason]

The file Backups.proto has been updated in the Signal-Android repository in the following commit: signalapp/Signal-Android@c6473ca

Here are the differences to the current version used by signal_for_android_decryption:

diff --git a/Backups.proto b/Backups.proto
index 98e4bdf..83227de 100644
--- a/Backups.proto
+++ b/Backups.proto
@@ -8,8 +8,7 @@ syntax = "proto2";
 
 package signal;
 
-option java_package         = "org.thoughtcrime.securesms.backup";
-option java_outer_classname = "BackupProtos";
+option java_package = "org.thoughtcrime.securesms.backup.proto";
 
 message SqlStatement {
     message SqlParameter {
@@ -55,8 +54,9 @@ message DatabaseVersion {
 }
 
 message Header {
-    optional bytes iv   = 1;
-    optional bytes salt = 2;
+    optional bytes  iv      = 1;
+    optional bytes  salt    = 2;
+    optional uint32 version = 3;
 }
 
 message KeyValue {
@@ -79,4 +79,4 @@ message BackupFrame {
     optional Avatar           avatar     = 7;
     optional Sticker          sticker    = 8;
     optional KeyValue         keyValue   = 9;
-}
+}
\ No newline at end of file

I'm not 100% sure that this means that any changes are needed in signal_for_android_decryption, but I though it might still be useful if I report it anyways.

For signal-backup-decode there is a PR addressing this changes, maybe this can give some pointers on what needs to be adapted: pajowu/signal-backup-decode#60