Add Mail Plugin Manager v2.0.6
user
```ruby
class MailPluginManager < Cask
  version 'latest'
  sha256 :no_check

  url 'http://www.chungwasoft.com/files/MPM_latest.zip'
  homepage 'http://www.chungwasoft.com/mailpluginmanager/'

  link 'Mail Plugin Manager.app'
end
```
assistant