• Fix bug causing idle websocket connections to be closed after 60 seconds
  (#1292).
• Fix MQTT 5.0 bug causing LWT not being sent when client disconnected with
  Disconnect with Will Message (0x04) (#1291).
• Ensure MQTT 5.0 subscription identifers are added to messages delivered via
  shared subscriptions (#1294).
• Fix protocol version check bug which would allow MQTT 5.0 clients to connect
  even if the MTT 5.0 protocol was not specified for the listener. This happened
  for clients which connected with an empty client-id.
• Fix bug in vmq_diversity and vmq_webhooks where the plugin hooks would be
  registered out of order, even though the plugins themselves would be started
  in the correct order (#1295).