/// <summary>
/// Increment the version for the node passed as argument. Returns a new VectorClock.
/// </summary>
/// <param name="node">Increment the vector clock value for a particular node.</param>
/// <returns>An updated <see cref="VectorClock"/> instance.</returns>
public VectorClock Increment(Node node)
{
var currentTimestamp = _versions.GetOrElse(node, Timestamp.Zero);
return(new VectorClock(_versions.SetItem(node, currentTimestamp + 1)));
}