This time mainly core changed, without mutch of new features 

• Internal changes regarding co-browsing. Support for co-browsing session based on online visitor. These changes were done to allow plugin initiate co-browsing session without a chat. This is pure for extensions purposes. No UX changes.
• NodeJS-Helper plugin update, chat became offline if no actions were processed for online timeout period. This happened only if NodeJS with publish notifications were used.
• Chat start chat will have automatic height for first time. UX improvement 

For update just follow standard update procedure For manual update it's update_105.sql