Just did this:
https://github.com/Homebrew/homebrew-cask/pull/69809
It's been merged into master now.
btw, adding brew cask install altserver to https://altstore.io is a good idea.
Please consider adding an alternative name of "altstore". I was searching for that instead.
More info on how to do it: https://github.com/Homebrew/homebrew-cask/blob/master/doc/cask_language_reference/stanzas/name.md
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btw, adding
brew cask install altserverto https://altstore.io is a good idea.