Add a reminder

Doc/whatsnew/whatsnew23.tex

@@ -13,6 +13,8 @@
 \maketitle
 \tableofcontents
 
+% Types now callable; `new' module replaced
+%
 % Timeout sockets: 
 % Executive summary: after sock.settimeout(T), all methods of sock will
 % block for at most T floating seconds and fail if they can't complete
@@ -670,6 +672,6 @@ as well as \UNIX.
 The author would like to thank the following people for offering
 suggestions, corrections and assistance with various drafts of this
 article: Michael Chermside, Scott David Daniels, Fred~L. Drake, Jr.,
-Detlef Lannert, Andrew MacIntyre. 
+Detlef Lannert, Andrew MacIntyre, Gustavo Niemeyer. 
 
 \end{document}