```ruby
class Shortcat < Cask
  url 'http://files.shortcatapp.com/v0.4.3.1/Shortcat.zip'
  homepage 'http://shortcatapp.com/'
  version '0.4.3.1'
  sha1 'f9362886edd9e5f7f8879f5d1b3031aea9126ae4'
  link 'Shortcat.app'
end
```

Update Shortcat to v. 0.5.1
user
```ruby
class Shortcat < Cask
  url 'http://files.shortcatapp.com/v0.5.1/Shortcat.zip'
  homepage 'http://shortcatapp.com/'
  version '0.5.1'
  sha1 '3c85e67b5cebc4925a1776cce4f8b0e07da61bba'
  link 'Shortcat.app'
end
```
assistant