Feature request / suggest: detect when message is pinned / unpinned

Telegram supports "[pinned messages](https://core.telegram.org/api/pin)"

Currently it seems not possible to detect when an incoming message is caused by a user (un)pinning a message.

It would be nice if an [updatePinnedMessages](https://core.telegram.org/constructor/updatePinnedMessages) or [updatePinnedChannelMessages](https://core.telegram.org/constructor/updatePinnedChannelMessages) update message could be "detected", so one knows that no response is required, or a response like: "Thanks for (un)pinning a message" could be given...