`VDomGuard::get_mut_ref` doesn't return a mutable reference

[ogghostjelly]

The VDomGuard::get_mut_ref method seems like it was suppose to return a mutable reference but instead it returns an immutable one.

impl VDomGuard {
    // this should return `&mut VDom` but doesn't!
    pub fn get_mut_ref(&mut self) -> &VDom {
        &mut self.dom
    }

   ...
}