Bot API 4.4 has arrived.

- Added support for animated stickers.
- Added support for default permissions in any groups.
- Added support for descriptions and invite links in basic groups.
- All webhook requests from the Bot API are now coming from the subnets 149.154.160.0/20 and 91.108.4.0/22. Update your configuration if you control inbound access with a firewall.
- The next Bot API update (v.4.5) will allow nested MessageEntity objects, make sure your code can correctly handle such entities.

Full changelog:
https://core.telegram.org/bots/api-changelog#july-29-2019