Add ClamXav (Version 2.3.6) Cask
user
```ruby
class Clamxav < Cask
  url 'http://www.clamxav.com/downloads/ClamXav_2.3.6.dmg'
  homepage 'http://www.clamxav.com/'
  version '2.3.6'
  sha1 '4e59947bc049109c375613979fb6092ffe67aa55'
  link :app, 'ClamXav.app'
end
```
assistant