Update icons dropping in Fontawesome metadata files

[derwaldgeist]

Thanks for this package. Currently, the icons are "hard-coded" using a fonts.js file, though, which makes it cumbersome to update the icons as the Fontawesome team is expanding them. The team offers metadata files here:

https://github.com/FortAwesome/Font-Awesome/tree/6.x/metadata

It would be awesome if we could just take the metadata files from there to update your package.