```ruby
class Iterm2Beta < Cask
  url 'http://www.iterm2.com/downloads/beta/iTerm2-1_0_0_20140421.zip'
  homepage 'http://www.iterm2.com/'
  version '1.0.0.20140421'
  sha256 'd9f3dd198febf46c272a8d4b473e35cae4cdfbf1963a7796114df53b5cb06c63'
  link 'iTerm.app'
end
```

Update iTerm 2 beta to 1.0.0.20140518
user
```ruby
class Iterm2Beta < Cask
  url 'http://www.iterm2.com/downloads/beta/iTerm2-1_0_0_20140518.zip'
  homepage 'http://www.iterm2.com/'
  version '1.0.0.20140518'
  sha256 'e10a1c859714f5449a0314629b24594205324bc80faad219c1f312872f64daa1'
  link 'iTerm.app'
end
```
assistant