Routes take a long time to draw. Over time, a Rails app can become slow
to boot simply because of how many routes it has. This script can be
used to detect routes that are drawn, but aren't actually valid.
Removing routes this script detects can help speed up your app and
remove dead code.

Example:

```
> bin/rails routes --unused

Found 2 unused routes:

Prefix Verb URI Pattern    Controller#Action
   one GET  /one(.:format) action#one
   two GET  /two(.:format) action#two
```