@Sanjibukai indeed the changelog on master has been updated for the upcoming release 
but at the time of writing, 0.13.3 has not been published to Hex.pm: phoenix_live_view | Hex
See: Releases · phoenixframework/phoenix_live_view · GitHub
Given that the tutorial is aimed at complete beginners, we aren’t going to instruct them to use the master LiveView version that has not been released yet.
Once a new version of LiveView is published, we will gladly accept a Pull Request updating the tutorial if necessary. But until then this is the bleeding edge. 
