Bot API 4.8 is live.

• Supported explanations in polls for Quizzes 2.0.
• Supported timed polls that close automatically at a predetermined moment. Use the new open_period and close_date fields.
• Supported new 🎯 animation for the Dice minigame.

Full change log:
https://core.telegram.org/bots/api-changelog#april-24-2020