Document removal of unnecessary 2>&1

I'm not sure why this was in here. I don't think it was the culprit in breaking the webhook -- but I don't have a clear idea of why the webhook wasn't using bash properly in the first place.

The webhook was broken because it couldn't run `workon` correctly (part of `virtualenvwrapper`, a bash alias and not an actual binary command) because the script it runs was being run under `sh` and not `bash`. I've restarted the webhook, and things seem to be all well now.