Section "Migrating from TextSecure to Silence" is outdated
Created by: johanw666
Bug description
This section in README.md starts with "In TextSecure, export a plaintext backup". However, Signal has the option for a plaintext backup removed for some time now. So exchanging messages will either require installing a custom build of Signal with this functionality re-added, or a 3rd party tool that can convert new-style Signal backups to xml (maybe as an extension on https://github.com/xeals/signal-back).