Add cask for Sublime Text 3 beta
user
```ruby
class SublimeText3 < Cask
  url 'http://c758482.r82.cf2.rackcdn.com/Sublime%20Text%20Build%203047.dmg'
  homepage 'http://www.sublimetext.com/3'
  version '3047'
  sha1 'cf20f30d0b0d406ced76784d9bdd63f817868f74'
  link 'Sublime Text.app'
end
```
assistant