It's important, both for users and developers know when there is new messages. So, here came this new version!! There are so much changes in the way the messages are recieved. Now, last message are stored, but not externally accessible. So, with that info, is possible to know if last message have been read, and add a notification icon.
Also, there have been added some callback functions to execute on message send or recieve, with all the message data. This may be helpfull to integrate the chat with some notification service, for example