Update Readme with new build instructions
Update Readme with new build instructions

mommel/mailvelope,Manouchehri/mailvelope,linagora/mailvelope,mailvelope/mailvelope,linagora/mailvelope,mailvelope/mailvelope,power12317/mailvelope,mommel/mailvelope,anthonymiyoro/mailvelope,mailvelope/mailvelope,Manouchehri/mailvelope,anthonymiyoro/mailvelope,Manouchehri/mailvelope,linagora/mailvelope,mommel/mailvelope,anthonymiyoro/mailvelope,power12317/mailvelope