Improve welcoming behaviour

[EugeneKay]

<jameslord> hi all
<gitinfo> jameslord: welcome to #git, a place full of helpful gits. If you have a question, just ask it–somebody should answer shortly. For more information about git and this channel, see the links in the topic. It can't hurt to do a backup (type !backup for help) before trying advice you receive here.
<jast> maybe I should have the autowelcome thing remember nicks and never respond to them again
<jast> remind me later to remember about that
* EugeneKay files an issue on Github about it
* milki reminds jast to remember something
<jast> s/about //, jeez. not a good day for language.

Also consider having it trigger on "hey" (I don't think it does presently), as long as you're in there.

[jast]

Thank you for the reminder. This is now live. Maybe it'll even work.