Add processing of edited messages by sender

[upanasiuk]

Hi!
When a customer edits a sent message, there is no notification or edited message in the support group.
I think it would be very useful to know that the client edited the message and see the edited text, not just the original.
My suggestion is to send a message with the changed text and mention that the message has been edited by the customer.

[github-actions]

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[gituser]

This is a must have feature for this bot.
Would be nice to have also ability for support to edit their messages.

Please implement it @bostrot.

Thanks.