Why not use Alternative instead of custom <|> operator?

[bsima]

I think the custom operator should be replaced with an Alternative instance: https://github.com/scotty-web/wai-middleware-static/blob/master/Network/Wai/Middleware/Static.hs#L96-L99

Of course you'll also need Functor and Applicative, not sure how hard that would be to implement. If you'll accept a patch for this, let me know and I'll look into it.