This update adds improved emails. You will now be told the username of the user that logged in/attempted to login, an if the username exists, it will be a link to their admin edit page.
There is also a new feature to email the specified addresses when a user that isn't an administrator attempts to login.
This update also removes the 'Enable Firewall' option.

AdminCP Firewall 管理员控制面板防火墙 1.4.0
限制管理员控制面板登陆IP