v0.2.0-alpha.2

A photo, an animation or a document can be sent to one member of a group
and changed in place while only they see it.

Added

• Ephemeral media. CaptionOptions gained Ephemeral, an Ephemeral
  with the receiver, the button press that authorizes the send and
  ReplaceCallbackQueryMessage, and ReplyToEphemeral, the incoming
  ephemeral message being answered. SendPhoto, SendAnimation,
  SendVideo, SendAudio and SendDocument take them, uploads included. A
  bot that is not an admin of the chat needs the press or the ephemeral
  message, within 15 seconds; an admin needs neither.
• EditEphemeralMessageMedia, EditEphemeralMessageCaption and
  EditEphemeralMessageReplyMarkup. The media edit uploads a new file as
  EditMessageMedia does. Telegram answers these with true, not a message,
  so the file_id of an upload is not reported. "Message is not modified" is
  success, as for the other edits.
• The three edits are in probeSafe: on an empty body Telegram's server
  asks for the media or the receiver before it does anything, so Preflight
  can require them.