Mention Hiro in the copyright notice as the code is based on Sylpheed's socket implementation.

git-svn-id: https://geany.svn.sourceforge.net/svnroot/geany/trunk@3365 ea778897-0a13-0410-b9d1-a72fbfd435f5

src/socket.c

@@ -3,6 +3,7 @@
  *
  *      Copyright 2006-2008 Enrico Tröger <enrico(dot)troeger(at)uvena(dot)de>
  *      Copyright 2006-2008 Nick Treleaven <nick(dot)treleaven(at)btinternet(dot)com>
+ *      Copyright 2006 Hiroyuki Yamamoto (author of Sylpheed)
  *
  *      This program is free software; you can redistribute it and/or modify
  *      it under the terms of the GNU General Public License as published by