Release v0.13.0b4
Release v0.13.0b4

mailvelope/mailvelope,Manouchehri/mailvelope,anthonymiyoro/mailvelope,anthonymiyoro/mailvelope,linagora/mailvelope,anthonymiyoro/mailvelope,mommel/mailvelope,Manouchehri/mailvelope,linagora/mailvelope,Manouchehri/mailvelope,linagora/mailvelope,mommel/mailvelope,mailvelope/mailvelope,mailvelope/mailvelope,mommel/mailvelope