GithubCommand: Edit initial reply if successful #34
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Making the initial deferred reply ephemeral caused the follow-up messages to show an ugly "Message could not be loaded" at the top, since the ephemeral message was deleted. And even if we didn't delete it, other users would not be able to load it.
This changes the initial reply to be visible to everyone and get edited on success. On failure, the initial reply is deleted again and a follow-up ephemeral message is posted to the user.