Update to Automerge 0.4.0 about automerge-swift HOT 1 CLOSED

pub trait OpObserver {
    /// A new value has been inserted into the given object.
    ///
    /// - `doc`: a handle to the doc after the op has been inserted, can be used to query information
    /// - `objid`: the object that has been inserted into.
    /// - `index`: the index the new value has been inserted at.
    /// - `tagged_value`: the value that has been inserted and the id of the operation that did the
    /// insert.
    fn insert<R: ReadDoc>(
        &mut self,
        doc: &R,
        objid: ExId,
        index: usize,
        tagged_value: (Value<'_>, ExId),
        conflict: bool,
    );