v0.13.0

• All CLI tools like mq-mail and mq-sendmail now ensure that sent messages use CRLF (\r\n) as mandated by the SMTP RFCs (a045882). Some SMTP servers reject messages which use only LF (\n).
• mq-send-test: provide feedback for interactive terminals (aa8207f)
• mq-send-test: prefer from setting from config file if --from=... is not set (ac615d5)
• also run tests for Python 3.13