Cannot install using homebrew

[David Wu]

$ brew install kjell
Updating Homebrew...
==> Auto-updated Homebrew!
Updated 1 tap (caskroom/cask).

Error: No available formula with the name "kjell"
==> Searching for a previously deleted formula...
kjell was deleted from homebrew/core in commit a072463e3:
  kjell: migrate to boneyard (https://github.com/Homebrew/homebrew-core/issues/3884)

To show the formula before removal run:
  git -C "$(brew --repo homebrew/core)" show a072463e3^:Formula/kjell.rb

If you still use this formula consider creating your own tap:
  http://docs.brew.sh/How-to-Create-and-Maintain-a-Tap.html