Bot API 4.5

[noplanman]

https://core.telegram.org/bots/api#december-31-2019

• Add support for two new MessageEntity types, underline and strikethrough.
• Add support for nested MessageEntity entities.
• Add support for nested entities and the new tags <u>/<ins> (for underlined text) and <s>/<strike>/<del> (for strikethrough text) in parse mode HTML.
• Add a new parse mode, MarkdownV2, which supports nested entities and two new entities __ (for underlined text) and ~ (for strikethrough text). Parse mode Markdown remains unchanged for backward compatibility.
• Add the field file_unique_id to the Animation, Audio, Document, PassportFile, PhotoSize, Sticker, Video, VideoNote, Voice, File entities and the fields small_file_unique_id and big_file_unique_id to the entity ChatPhoto.
• Add the field custom_title to the ChatMember entity.
• Add the new method setChatAdministratorCustomTitle to manage the custom titles of administrators promoted by the bot.
• Add the field slow_mode_delay to the Chat entity.