merging PR #534: Reduce noise from chaosbot when closing issues
merging PR #534: Reduce noise from chaosbot when closing issues

https://github.com/chaosbot/Chaos/pull/534: Reduce noise from chaosbot when closing issues

Description:
We already get an alert that the issue is closed so no need to output another message.

:white_check_mark: PR passed with a vote of 9 for and 0 against, a weighted total of 9.0 and a threshold of 6.1, and a current meritocracy review.

Vote record:
@Leigende: 1
@MaloJaffre: 1
@PlasmaPower: 1
@amoffat: 1
@andrewda: 1
@qgustavor: 1
@rhengles: 1
@rudehn: 1
@xyproto: 1
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