Add cask for Fira Code v0.3
user
```ruby
cask :v1 => 'font-fira-code' do
  version '0.3'
  sha256 'a90721b6b1de4640ace744657432a990aae4c8e403b78141a50d0a7abd305db7'

  url 'https://github.com/tonsky/FiraCode/releases/download/0.3/FiraCode-Regular.otf'
  homepage 'https://github.com/tonsky/FiraCode'
  license :ofl

  font 'FiraCode-Regular.otf'
end
```
assistant