mimes option for serve-static

[ryuapp]

What is the feature you are proposing?

This feature supports rarely used content-types and great amount of types.
Also, I think to remove unnecessary default MIME to make it lighter in the future.

// HLS
const mimes = {
  m3u8: 'application/x-mpegURL',
  ts: 'video/mp2t'
}
app.use('/video/*', serveStatic({mimes}))

[yusukebe]

Hi @ryuapp

I think this will be a good feature. If you can create the PR, please make it based on the "v4" branch. We are now making all new features in v4.