Update release notes
Update release notes

See
git log --format=oneline 1dba82d..HEAD
for a more complete list since the 1.8 release.

GerHobbelt/civet-webserver,GerHobbelt/civet-webserver,GerHobbelt/civet-webserver,GerHobbelt/civet-webserver,GerHobbelt/civet-webserver,GerHobbelt/civet-webserver