Update credits
Update credits

Add all new authors since the last update.
From the git history:
git log --format="%aN" c66ccca04ab296228a28d86a93978107e07f061b..HEAD | sort -u

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