Upgrade to 0.7.0

MessageRepository version handling.

The implementations of the MessageRepository interface are now expected to return the latest version number as the Generator return value. This can be done by returning it within the function you yield the messages from.

An simplified example:

function getMessages(AggregateRootId $id): Generator
{
  foreach (fetchFromStorage($id) as $row) {
     yield convertRowToMessage($row);
  }

  return isset($row) ? $row['version'] : 0;
}

MessageRepository fetch after specified version.

The MessageRepository interface has a new method, called retrieveAllAfterVersion. This method is expected to return all the messages after a given aggregate root version. Adding this method will ensure your application is prepared for snapshotting.