Never Have To Click Update Button Again! Now WordPress itself can get automatically updated with all your themes and plugins.
Automatic Updater is the new WordPress plugin that keeps your WordPress install up to date with latest releases.
But be aware, Its useful for most sites but exercise caution if you have any custom WP themes or WP plugins active on your site.
Secondly, you should also be aware that this will only work on installs that have appropriate file permissions for making updates from web interface – it will not be working if usually FTP updates to your server.
You may check for Actions and Filters in Documentation for learning more.