Edits to existing messages should be ignored

[noah-guillory]

As is, one can edit their message calling the bot for a request and the bot will still carry out the request over and over again. We should be ignoring edits and only paying attention to actual new messages

[andrewmiller-ats]

Should just be as simple as checking if the slack event message type has an "edited" field and not honoring the request if it does
https://api.slack.com/events/message