caskroom/homebrew-cask — pull request #4847 by rolandwalker (2014-06-12 16:32:18+00:00)
Title: Extend `appcast` stanza

Extend `appcast` stanza to support multiple keys
- `:sha256`
- `:format` (default is `:sparkle`)
- `:latest_version` (experimental, may be removed)

add tests