Update and sort CREDITS.md
Update and sort CREDITS.md

Add all new authors (extracted with the following command):
git log --format="%aN" 664fdf7..HEAD | sort /unique

And sort the entire list of CivetWeb authors

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