Declaration of Kalnoy\Nestedset\Node::append() should be compatible with Illuminate\Database\Eloquent\Model::append($attributes)

[Spoowy]

This error breaks my stuff since latest update.

ErrorException in Node.php line 1195:
Declaration of Kalnoy\Nestedset\Node::append() should be compatible with Illuminate\Database\Eloquent\Model::append($attributes)

[lazychaser]

See #53