examples: fix route in params example

closes #3310

examples/params/index.js

@@ -68,7 +68,7 @@ app.get('/users/:from-:to', function(req, res, next){
   var from = req.params.from;
   var to = req.params.to;
   var names = users.map(function(user){ return user.name; });
-  res.send('users ' + names.slice(from, to).join(', '));
+  res.send('users ' + names.slice(from, to + 1).join(', '));
 });
 
 /* istanbul ignore next */