[aur-general] Make AUR notifier messages more visible

Hi I found that AUR comment emails are too invisible in my mailbox. The reason is that notifier sends messages to aur-notify@archlinux.org and hides my email in "bcc". Thus email clients (e.g. gmail) do not mark those emails with ">" symbol and they lost in miriads of similar emails from maillists. It would be better if these emails were sent "to" user email as it makes such emails more visible.