RELEASE-NOTES: only list Nick once

Even though he's a fine dude, once is enough for this time!

RELEASE-NOTES

@@ -55,9 +55,9 @@ This release would not have looked like this without help, code, reports and
 advice from friends like these:
 
  Nick Zitzmann, Colin Watson, Fabian Keil, Kamil Dudka, Lijo Antony,
- Linus Nielsen Feltzing, Marc Hoersken, Nick Zitzmann, Stanislav Ivochkin,
- Steve Holme, Yang Tse, Balaji Parasuram, Dan Fandrich, Bob Relyea,
- Gisle Vanem, Yves Arrouye, Kai Engert, Lluís Batlle i Rossell
+ Linus Nielsen Feltzing, Marc Hoersken, Stanislav Ivochkin, Steve Holme,
+ Yang Tse, Balaji Parasuram, Dan Fandrich, Bob Relyea, Gisle Vanem,
+ Yves Arrouye, Kai Engert, Lluís Batlle i Rossell
 
         Thanks! (and sorry if I forgot to mention someone)