message: Fix incorrect assertion
diff: @@ -426,7 +426,7 @@ void Transaction::upgrade_file_format(int target_file_format_version)
  // DB::do_open() must ensure this. Be sure to revisit the
  // following upgrade logic when DB::do_open() is changed (or
  // vice versa).
  - REALM_ASSERT_EX(current_file_format_version >= 5 && current_file_format_version <= 20,
  + REALM_ASSERT_EX(current_file_format_version >= 5 && current_file_format_version <= 21,
  current_file_format_version);
  