Small utility to help you manage packages installed via Homebrew Cask as it currently can't upgrade installed packages for you or clean up old versions.
The script will ask you if you want to upgrade applications which has newer versions available. Downloads from previous versions of applications will be removed when an application is updated, like what Homebrew has been doing since version 2.0.0. This behaviour can be disabled by setting the environment
variable HOMEBREW_NO_INSTALL_CLEANUP.