Make jouncebot use /privmsg rather than /notice

If you want to inform individuals, and only them, you should use /query.
If you want to get people to do something, and for others to be aware, /privmsg in channel.
If you want everyone to be vaguely aware of something related to the channel, /notice.

The purpose of jouncebot is to specifically remind some people (hey, you, go deploy) and vaguely remind others (hey, this is about to happen), so privmsg is more appropriate than notice. Alternatively, we could do a combined notice to the channel and query to each of the deployers, but…