Pass custom parameters via Class@Method?

Hi,

is it possible to pass custom parameters via [Class@Method](https://github.com/bramus/router#classmethod-calls)?
I am aware that something like this works:

```
class Handler {
public static function detail($name) {
echo 'Hello ' . htmlentities($name);
}
}
$router->get('/hello/{name}', 'Handler@detail');
```

Any way to pass parameters which `detail` may require?
e.g.

```
public static function detail($name, $customPar, $customPar2) {
...
$router->get('/hello/{name}', 'Handler@detail', $customPar, $customPar2);
```

Start by reading the repository documentation for Class@Method calls and the $router->get route-registration entry point. Trace how route parameters reach Handler@detail, then define the expected behavior for additional custom parameters; done means there is a clear, documented way to supply them and the behavior is covered by tests.

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