After meeting checklist

Change channel topic to have the date of the next meeting.
Edit meetings repo:
1. Add minutes and log. Log times should be in UTC.
2. Copy fresh agenda-template.md to agenda.md.
Edit IRC meetings on the wiki:
1. Update next meeting date.
2. Add previous meeting to the list: eg. November 11th [[meetings>2017/2017-11-11NOTES.md|Minutes]] [[meetings>2017/2017-11-11LOG.txt|Log]].
Post to mailing list:
1. Links to minutes and log of finished meeting.
2. Announce the next meeting 1-1.5 weeks ahead.