$ xcode-select --install
$ sudo easy_install pip
$ sudo pip install battleschool
$ battle -K --config-file https://raw.githubusercontent.com/marksb/battle-config/master/config.yml
According to this article is
not possible to use brew cask alfred link
to find installed applications via
brew cask
To work around that issue, you should add default's Caskroom directory inside Alfred's preferences:
/opt/homebrew-cask/Caskroom