Package name with a hyphen produces a 404 badge not found

[hschwalm]

const config: BadgesConfig = {
  left: 'react-dom',
  right: '17.0.0',
  color: 'CC3534',
  url: 'https://npmjs.org'
};
return renderBadge('shields', config);

[balupton]

Odd. Maybe this is a bug with shields. Someone will need to debug further, as I'm too busy.