Bot API 4.5 is here right before 2020:
- New
MarkdownV2 that supports new entity types (
underline and
strikethrough) and
nested entities.
- New and
Nested Entities in incoming messages and captions.
- Added support for
custom titles in groups.
- Added new
slow_mode_delay field in Chat object.
Full changelog:
https://core.telegram.org/bots/api-changelog#December-31-2019