Add cask for Serial Cloner
user
```ruby
class SerialCloner < Cask
  url 'http://serialbasics.free.fr/Serial_Cloner-Download_files/SerialCloner2-6.dmg'
  homepage 'http://serialbasics.free.fr/Serial_Cloner.html'
  version '2.6.1'
  sha1 'e5df2593bc860cca8ed6abc268cd9922e9836f39'
  link :app, 'SerialCloner2-6'
end
```
assistant