```ruby
class FontCardo < Cask
  url 'http://scholarsfonts.net/cardo104.zip'
  homepage 'http://scholarsfonts.net/cardofnt.html'
  version '1.04'
  sha1 'fb156361986052071fa8df09ab6c95749c5dad07'
  font 'Cardo104s.ttf'
  font 'Cardoi99.ttf'
  font 'Cardob101.ttf'
end
```

Update Cardo to sha256 checksums
user
```ruby
class FontCardo < Cask
  url 'http://scholarsfonts.net/cardo104.zip'
  homepage 'http://scholarsfonts.net/cardofnt.html'
  version '1.04'
  sha256 '9401db6357cb71fa1f8791323679f81d6b0473d6280a7ec8abdf11b5e52f455f'
  font 'Cardo104s.ttf'
  font 'Cardoi99.ttf'
  font 'Cardob101.ttf'
end
```
assistant