Fixed reference to putty-bugs@lists to putty@projects.

[originally from svn r1594]

README

@@ -41,7 +41,7 @@ The PuTTY home web site is
     http://www.chiark.greenend.org.uk/~sgtatham/putty/
 
 Bug reports and feature requests should be sent to
-<putty-bugs@lists.tartarus.org>. PLEASE read the section on the web
+<putty@projects.tartarus.org>. PLEASE read the section on the web
 site about how to report bugs effectively. Do NOT send one-line
 reports saying `it doesn't work'!