fn is not run before specific route when using router.use(path, fn)

[wdanxna]

Document says:

To run middleware before a specific route, also pass the optional path:

const router = require('koa-joi-router');
const users = router();

users.get('/:id', handler);
users.use('/:id', runThisBeforeHandler);```

but runThisBeforeHandler is actually run after handler

[aheckmann]

fixed the docs